Document 1QxX5VaLe208nmp4jbpQweZra
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N E W B R U N S W I C K . N. J.
July 8, I 97I
R. S c h a f f n e r , P h . D. D irector, Office Product Technology B u re au of Foods Food and Drug Administration 200 C Street Washington, D. C.
S u b j e c t : J O H N S O N 'S B a b y P o w d e r
Dear Dr. Schaffner:
As we d i s c u s s e d , we a r e p r o v id i n g h e r e w i t h the following r e p o r t s of a n a ly s e s of JOHNSON'S Baby P o w d e r and v a rio u s sam p les of Vermont Talc used in JOHNSON'S Baby Pow der.
1. June 24, 1971, R e p o r t on P a r t i c l e Size and Shape D istributions of G ran th am , Italian, and V erm o n t Talc Final Products for Johnson & Johnson by Colorado School of Mines R esearch Institute.
2. J u ly 7, 1971, X - r a y a n a l y s e s r e p o r t on JOHNSON'S Baby P o w d e r sam p le 344-B, and six sam ples of V e rm o n t Talc by C o lo rad o School of Mines R e s e a r c h Institute.
3. June 28, 1971, R ep o rt of x - r a y exam ination of Talc Products by Dr. R. C. Reynolds, Jr. , Geology Dept. , Dartmouth College, Hanover, New Hampshire.
We will be pleased to answ er any questions regarding the data and m ethods used in the analyses during our m eeting with you today.
It should be noted that the information and data submitted herein con tains trade secrets, com m ercial or financial information or privileged or confidential inform ation, and the Food and Drug A dm inistration is not authorized to m ake it public without w ritten perm ission fro m the company.
Very truly yours,
JOHNSON & JOHNSON
WN:dw Submitted in triplicate
by: W. N ashed D i r e c t o r of Science In fo rm a tio n
A rv W M o n 0
:JOHNSONCS Baby Powder Lot #344L _____ ___
New Brunswick, NmL July 6, 1971
D r . W. Nashed
The above lot of regular production Baby Powder was compounded into finished goods for sale on the second shift of December 10, 1970, at our Eastern Surgical Dressing Plant.
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W- Ashton
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Approved:
H. Foncier Dirptor
Golden, Colorado 80401
R eport On
P article Size and Shape D istributions of Grantham, Italian, and Verm ont Talc
Final Products Johnson &Johnson
Prepared for Johnson &Johnson
Research Center R esearch and Development
New Brunswick NJ 08901
Project Engineer Mining Division
. W, T. C aneer, A s s is ta n t M anager, Mining Division
P roject No. 390517
June 24, 1971
M ineralogical Type
344-L
Ital. O. S.
Platy talc and/or chlorite
0.002765 0, 001750
Free diamond shaped particles
0.000030
Free carbonates
0.000265 - 0. 000707
Free quartz
0.000404 0.000026
F r e e talc s h a r d s 0.000353 0.000205
F ree nontalc needles
0. 000027 . 0. 000021
F ree talc needles 0.000022 0.000029
F ree other
0. 000013 * 0. 000005
Granular particles
Dark opaque
0.000215 0. 000207
ESEARCH INSTITUTE
TABLE 3
A verage sq m m Size of P a rtic le s in Each (
Ital. U. S.
P e rc e n t of G rains C
Lot No. 2 Grantham
July 1970
Sept 1970
0.002190 0.000996 0.002661 0. 001
- O.OOO924 0 . 0001
0.000877 0. 000024
0.000591 0.000047 - 0.000051
0. 000: 0. 000:
0 . 0003 63 0. 00 0 1 3 0 0 . 0 0 0 3 4 3 ; O/OO;
'i'
0.000030 0.000030 0.000004
_
0. 000024 0. 000036 0. 000068 0.000033 0 . 0 0 0 0 0 4 *0. 000007
0 . oooc 0.0000 0.0000
0.000081
0. 0001
C O L O R A D O S CHOOL OF M I N E S . R E SE AR C H I NS T I T UT E
TABLE OF CONTENTS
Page
In tro d u c tio n ................... . . ............................................................ R e s u lts and C o n c l u s i o n s .........................................................
1 2
P la ty P h a s e .............................................. ... ................................................. ... . Talc S h a rd s. ................................... Nontalc N e e d l e s ................................ Q u a r t z ................................................................................................................... C arbonate. ........................................................................................................... " O th e r " P a r t i c l e s ....................................................................
2 3 3 3 3 3
D i s c u s s i o n ......................
4
G eneral R esults of G rain Counts. . . . . . . . . . . . . . . . . . D etailed R e s u lts of G ra in Counts .........................................
4 8
P la ty T alc a n d /o r C h l o r it e .................................
8
T alc S h a r d s .................^ . . . ... .................. ! . . .......................... 30
N ontalc N e e d l e s ................................................................................ Q u a r t z ................................................................................................... C a r b o n a te ............................................................................................... " O th e r" P a r t i c l e s ............................................................................
32 33 34 34
o
r
ii
Co l o r a d o s c h o o l of m i n e s r e s e a r c h ' in s t it u t e
INTRODUCTION
M r. Wm. Ashton of Johnson & Johnson requested that we do detailed size, shape, and m ineralogical analyses on the following sam ples:
1. 3 4 4 - L (a r e p r e s e n ta t iv e final V e rm o n t product) 2. Ita lia n O. S. (an Ita lia n final p ro d u c t ground o v e rs e a s ) 3. Ita lia n U. S. (an Ita lia n final p ro d u ct ground in the United States) 4. Lot No. 2 G ra n th a m (a r e p r e s e n t a t i v e sam ple of the 19 acceptable
b a r r e l s fro m the continuous pilot plant run at CSMRI) 5. V e rm o n t, July 1970--^ 6. V e rm o n t, S e p tem b er 1970--^ 7. V e rm o n t, N o v e m b er 1970--^ . 8. V e rm o n t, Ja n u a ry 197 l-- 9. V e rm o n t, M a rc h 1971--^ 10. V e rm o n t, May 1971--^ 1/ These w ere grab sam ples from the Vermont plant during the
various months.
Point counts w ere m ade on 500 g ra in s fro m each sam ple at 500X. The m in eral type and maximum and m inim um dimensions w ere determ ined for each grain.
1
C O L O R A D O S CH OO L OF M I N E S R E S E A R C H I N S T I T U T E
RESULTS AND CONCLUSIONS
r
' Platy Phase
Within the siz e ra n g e of <0.001343 sq m m to 0. 025531 sq m u \ the
following were noted;
1. The G ra n th a m Lot No. 2 s a m p le a p p e a re d to have the s m a ll e s t
particle size.
'Vr
. 2. T he V e rm o n t p ro d u c ts a p p e a re d to have the l a r g e s t p a r tic le size.
1
3. The Italian p ro d u c ts a p p ea re d in te rm e d ia te in size betw een the Grantham and Vermont products.
W ithin the s iz e ra n g e of <0. 0001 sq m m to 0. 001343 sq m m . the
following were noted:
l e The 344-L representative Vermont sample showed the sm allest amount of platy m a te ria l in the <0. 0001 sq mm range, and the Lot No. 2 G rantham sam ple had the la rg e st amount of platy . m a t e r i a l in the 0. 0005 to 0. 001 sq mm range.
2. T he Ita lia n s a m p le s had the l a r g e s t amount of platy m a t e r i a l 11 in the <0. 0001 sq m m ran g e.
The following w ere noted relative to length/width ratio*1
1. T he V e rm o n t and Italian s a m p le s showed a m a jo r p o rtio n of p laty p a r t i c l e s in the 1. 1 to 1. 5 length/w idth ra tio ran g e .
\' ' 2, T h e Lot No. 2 G ra n th a m p ro d u c t showed a m axim um am ount
of platy p a r t i c l e s in the 1. 6 - 2 .0 length/w idth r a tio ran g e .
-A 2
C O L O R A D O S C H O O L OF M I N E S RESEARCH- I N S T I T U T E
Talc Shards
The m ost significant trend noted in reg ard to talc shards was that
the Ita lia n O. S. product p o s s e s s e d s h a r d s that fell w ithin a m o re r e s t r i c t e d
siz e r a n g e than the Italian U. S. sa m p le . T his could p o s s ib ly in d icate
different grinding techniques. Talc Needles
'"sv.
The 3 4 4 -L V erm o n t sam ple had the la rg e s t num ber of talc needles,
but the shortest needle lengths.
Nontalc Needles The Grantham Lot No. 2 sam ple had the larg e st num ber of nontalc
needles but the shortest nontalc needle length.
Quartz The 3 4 4 -L sam ple had the m o st quartz and the Lot No. 2 G rantham
sam p le had esse n tia lly no quartz.
Carbonate
\ No significant tren d s w ere noted in reg ard to carbonate content
between the various sam ples.
''O th e r 1* P a r t i c l e s * The 3 4 4 - L V e rm o n t sa m p le had the l a r g e s t num ber of, and the
largest sized, "other" particles.
3
C O L O R A D O SCHOOL OF M I N E S R E S E A R C H I N S T I T U T E
DISCUSSION
G eneral R esults of G rain Counts Each sample was point counted to determ ine the o ccurrences of
m in e ra l types and th e ir average size in sq mm. The following table shows
the p e rc e n ta g e s of m in e r a l ty p es in e a c h sample, b a sed on the n u m b er of
grains counted;
TABLE 1
P ercent of G rains in E ach Category on a G rain Count Basis
Mineralogical Type
P e r c e n t of G ra in s Counted
Ital. Ital. Lot No. 2 July Sept Nov Jan M ar May 344- L O. S. U. S. G ra n th a m 1970 1970 1970 1971 197 1 1971
T ty talc and /o r chlorite
F ree diamond shaped particles
Free carbonates Free quartz F ree talc shards F ree nontalc needles Free talc needles Free other Granular particles
Dark opaque
87. 3
1. 0 1. 4 1. 6 2. 8 0. 6 2. 2 2. 8
-
0. 2
90. 2 89. 4
--
0. 4 2. 2 0. 4 0. 2 4. 8 5. 2 0. 4 0. 4 1.4 0. 8 2. 0 1. 8
-0. 4 -
9 2> 6
-
0. 2 3. 0 1. 0 1. 2 1. 8
-
0. 2
89. 2 86. 8 90. 4 89. 2 86. 0 87.0
0. 2 0 .4 0. 2 0. 6 0. 4 0. 6
1. 0 1. 2 1. 4 2. 2 2. 0 0 .4
1. 0 2. 0 0. 8 0. 2 0. 6 1. 2
2. 8 2. 2 1.4 1. 6 3. 8 1. 6
. 1. 0 0. 8 0. 4 0. 8 1. 0 0. 8
0. 8 1.4 0. 6 1. 0 1. 8 2. 2
4. 0 4. 6 4. 8 4. 4 4. 2 5. 6
- - - - - 0. 6
- 0. 6 -
- 0. 2 -
Following are explanations for the above term s-
L The platy talc a n d /o r chlorite p articles usually had nonopaque inclusions of various types and sizes. As per your instructions these were not counted separately.2
2. T he " d iam o n d shaped p a r t i c l e s " w e re te n ta tiv e ly identified as pyroxene and/or carbonate.
4
C O L O R A D O S C H O O L OF M I N E S R E S E A R C H I N S T I T U T E
3. The "ca rb o n ate s" noted m ay include m agnesite, dolom ite or calcite.
j
4. The "quartz" noted was identified using interference figures where possible. Where not possible, due to size, conchoidal fractures re lie f and interference co lo rs w ere used for identification.
5. The "talc s h a rd s " noted w e re thin p ie c e s th at could c le a r ly be defined as being broken off of plates.
6. T he " ta lc " and "nontalc" n e e d le s noted w e re definite n e e d l e - l i k e p articles and not shards. The two types w ere defined by differences in extinction angles.
7. The "other p a rticle s" noted w ere nonopaque particles, usually of a - very sm all size and not readily identifiable optically. They invariably exhibited h ig h e r r e l i e f than the 1. 600 oil u se d and higher i n te r f e r e n c e colors than talc.
8. The " g ra n u la r p a rtic le s " noted w e re non d escrip t m a sse s of very fine
grains. The individual grains w ere alm ost submicroscopic and
could not be positively identified. Brucite or granular talc are
possibilities.
v
9. The " d a r k opaque" a r e p a r tic le s that do not tra n s m it light.
Table 2 shows the percentage of m in eral types in each sam ple on a
to ta l sq m m b a s is , and T able 3 shows the a v e r a g e Sq mm siz e of p a r t i c l e s
in each m ineralogical category.
\
\
5
C O L O R A D O S C H O O L OF M I N E S R E S E A R C H I N S T I T U T E
\ TABLE 2
P ercent of P a rtic le s in Each Category on a Total sq m m B asis
M ineralogical Type
Ital. 3 4 4 -L O. S.
Ital. U. S.
P ercent of G rains Counted
Lot No. 2 July Sept Nov
G rantham 1970 1970
1970
Jan 1971
Mar 1971
May 1971
Platy talc and/or chlorite
F ree diamond shaped particles
99.100 99.110 98. 0 67
0. 010
-
99. 314 -
99. 515 99. 226 99. 936 99.400 99. 1012 99.230 0. 002 0. 002 0. 001 0. 001 0. 0012 0. 010
F ree carbonates
0. 150
F ree quartz
0. 270
F ree talc shards
0. 410
F r e e nontalc needles- 'f 0. 010
F ree talc needles
0. 020
F ree other
0. 010
Granular particles
-
Dark opaque
0. 020
0. 178 0. 006 0. 617 0. 005 0. 026 0. 006
-
0. 052
0. 966 0. 002 0. 944 0. 006 0.012 0. 003
-
-
0. 127 -
0. 420 0. 026 0. 0840. 008
0. 017
0. 020 0. 021 0. 404 0. 015 0. 011 0. 012
-
0. 256 0. 228 0. 156 0. 023 0. 283 0. 792 0. 006 0. 005
/ 0. 022 0. 004 0. 013 0. 001
-0. 036 -
0. 290 0.0881 0. 010
0. 020 0. 0215 0. 030
0. 150 0.7311 0. 450
0. 020 0 .0119 0. 0 20
0. 050 0. 0295 0. 030
0. 060 0. 0150 0. 020
- - 0. 0 20
- 0.0003
-
\
C O L O R A D O S C H O O L OF M I N E S R E S E A R C H I N S T I T U T E
j As may be noted from the above data: (I 1. T he p e rc en ta g e of p la te s on a g r a in count b a s i s is c o n s id e ra b ly l e s s than the p ercentage of p lates on a total sq m m b a s is .
2. T he p e rc en ta g e of nontalc c o n stitu en ts, talc n e e d le s and talc s h a r d s is considerably higher on a grain count basis than on a cumulative sq mm basis.
3. The av erag e p late siz e is s m a lle s t in the Lot No. 2 G rantham products, interm ediate in the Italian products and larg e st in the Vermont products.
4. No f r e e diam ond-shaped p a rtic le s w ere noted in the Lot No. 2 G rantham or the Italian products.
5. The Lot No. 2 G ran th am o re was the only one showing no quartz.
6. T he Lot No. 2 G ra n th a m showed the h ig h e st p e rc e n t of p la te s on a grain count basis.
T he " g r a n u l a r p a r t i c l e s " noted in the May 1971 sa m p le w e re i r r e g u l a r
V
gelatineous m a s s e s of v e ry fine g ra in s that could not be positively identified.
T hese p a rtic le s w ere not noted in any of the other sam ples.
Detailed Results of G rain Counts
1
To better define the particle shape and size in each sample, plots
w ere m ade-involving length/w idth ratio s a n d /o r size distribution of the
v ario u s com ponents in each sam ple. Following a re the r e s u lts of th ese
analyses:
Platy Talc and/or Chlorite
F i g u r e s 1 th ro u g h 20 show plots of the r a t i o of length to width and
the siz e d is trib u tio n in sq m m of the platy com ponents of each sam ple.
8
PLOT OF LENGTH/W IDTH RATIOS FOR TH E
OF SIZ E DISTRIBUTION (Sq mm) OF THE PLATY P H A SE OF SA M P LE 3 4 4 - L
EXPLANATION ( A R E A Sq mm)
1= 0 - 0 . 0 0 1 3 4 3
2= 0 . 0 0 1 3 4 6 - 0 . 0 0 2 6 8 7 3= 0 . 0 0 2 6 9 0 -- 0 . 0 0 4 0 3 1 200 4= 0 . 0 0 4 0 3 4 -- 0 . 0 0 5 3 7 5 5=' 0 . 0 0 5 3 7 8 -- 0 . 0 0 6 7 1 9 6= 0 .0 0 6 7 2 1 -- 0.0 0 8 0 6 2 7= 0 . 0 0 8 0 6 5 -- 0 . 0 0 9 4 0 6 8= 0 . 0 0 9 4 0 9 -- 0 . 0 10 7 5 0 9= 0 . 0 10752 -- 0 . 0 12093 10= 0 . 0 1 2 0 9 6 -- 0 . 0 1 3 4 3 7 1 1= 0 . 0 1 3 4 4 0 -- 0 . 0 147 8 1 12= 0 . 0 14 7 8 4 -- 0 . 0 16 12 5 13= 0 . 0 1 6 1 2 7 -- 0 . 0 17 4 6 8 14 = 0 . 0 1 7 4 7 1 -- 0 . 0 1 8 8 12 15= 0 . 0 1 8 8 1 5 -- 0 . 0 2 0 1 5 6 16 = 0 . 0 2 0 15 9 -- 0 . 0 2 1 5 0 0 17= 0 . 0 2 1 5 0 2 -- 0 . 0 2 2 8 4 3 18= 0 . 0 2 2 8 4 6 -- 0 . 0 24 18 7 19= 0 . 0 2 4 19 0 -- 0 . 0 2 5 5 3 1
TOTAL No. OF PLATES 4 34 AVERAGE Sq mm PLATE SIZE 0.002765
*= PERCENTAGE OF PLATES IN EACH CATEGORY
NUMBER OF PARTICLES
0.7% 0.5% 0.5% o % 0% 05/o 0% 0 % 0% 0% 0% 0%
JL x
6 7 8 9 IO II 12 13 14 15 16 17 18 19
(SEE EXPLANATION ABOVE)
m
t f w W I 4 fc,
U
PLOT OF LENGTH/W IDTH RATIOS FOR T H E
NUMBEi OF PARTICLES
PLOT OF SIZ E DISTRIBUTION (Sq mm) OF THE PLATY P H A S E OF S A M P L E ITALIAN 0. S.
EXPLANATION ( AREA Sq mm)
0 --0.001543 2= 0 . 0 0 1 346 -- 0. 0 0 2 6 8 7 3= 0 . 0 0 2 6 9 0 -- 0. 0 0 4 0 5 1 4= 0 . 0 0 4 0 3 4 -- 0. 0 0 5 3 7 5 5= 0 . 0 0 5 3 7 8 -- 0. 0 0 6 7 1 9 6- 0 . 0 0 6 7 2 1 -- 0. 0 0 8 0 6 2 7= 0 . 0 0 8065 -- 0. 0 0 9 4 0 6 8= 0. 0 0 9 4 0 9 -- 0 . 0 I 0 7 5 0 9= 0 . 0 10752 -- 0, 0 I 2 0 9 3 10= 0 .0 1 2 096 -- 0. 0 1 3 4 3 7 11= 0 . 0 1 3 4 4 0 -- 0. 0 1 4 7 8 I 12= 0. 0 14 7 8 4 -- 0. 0 I 6 I 2 5 13= 0 . 0 1 6 1 2 7 -- 0 . 0 1 7 4 6 0 14= 0. 0 1747 1 -- 0 . 0 1 8 8 ! 2 15= 0.0 188 15 -- 0. 0 2 0 1 5 6 16= 0. 020 159 -- 0 . 0 2 1 5 0 0 17= 0. 021 5 0 2 -- 0. 0 2 2 8 4 3 18= 0. 0 2 2 8 4 6 -- 0. 0 2 4 ! 8 7 19= 0. 024 19 0 -- 0. 0 2 5 5 3 I
TOTAL No. OF PLATES 4 51
AVERAGE Sq mm PLATE SIZE 0.001750
100 #= PERCENTAGE OF PLATES IN EACH
NUM3L . OF PA RTICLES
PLOT OF LENGTH/W IDTH RATIOS FOR TH E
NUMBE OF PARTICLES
PLOT OF S IZ E DISTRIBUTION (Sq mm) O F THE PLATV P H A S E OF S A M P L E ITALIAN U.S.
EXPLANATION (AREA Si) mm)
1= 0 -- 0 . 0 0 1 3 4 3 2= 0 . 0 0 1 346 - 0. 0 0 2 6 8 7 3= 0 . 0 02690 -- 0. 0 0 4 0 3 1 4= 0 . 0 0 4 0 3 4 -- 0. 0 0 5 3 7 5 5= 0 . 0 0 5 3 7 8 -- 0 . 0 0 6 7 1 9
6= 0 . 0 0 6 7 2 1 -- 0. 0 0 8 0 6 2
7= 0 . 0 0 8065 -- 0. 0 0 9406 8= 0. 0 0 9 4 0 9 -- 0 . 0 10 7 5 0 9= 0. 0 10752 -- 0. 0 1209 3 10= 0 . 0 1 2 096 -- 0. 0 13437 11= 0 . 0 1 3 4 4 0 - 0 . 0 14 78 1 12= 0 . 0 14784 -- 0. 0 16 12 5 13= 0 . 0 1 6 1 2 7 -- 0 . 0 17468 14= 0. 0 1747 1 -- 0 . 0 188 12 15= 0 .0 188 15 -- 0 . 0 2 0 1 56 16= 0. 0 2 0 159 -- 0. 0 2 l 5 0 0 17= 0 . 0 2 1 5 0 2 -- 0. 0 2 2 8 4 3 S8= 0. 0 2 2 8 4 6 -- 0. 0 24 18 7 19= 0. 0 2 4 'l 9 0 -- 0. 0 2 5 5 3 1
TOTAL No. OF P L A T E S
4 47
AVERAGE Sq mm PLATE SIZE 0.002190
PERCENTAGE OF PLATES IN EACH CATEGORY
PLOT OP LENGTH/W ID TH RATIOS FOR. TH E
OF PARTICLES
I
200
ISO 100
PLOT OF S IZ E DISTRIBUTION (Sq mm) OF THE PLATY P H A S E OF S A M P L E GRANTHAM LOT Z
EXPLANATION (AREA Sq mm)
1= 0 - 0 . 0 0 1 3 4 3 2= 0 . 0 0 1 3 4 6 - 0. 0 02687 3= 0 . 0 0 2 6 9 0 -- 0. 0 0 4 0 3 1 4= 0 . 0 0 4 0 3 4 -- 0. 0 0 5 3 7 5 5= 0 . 0 0 5 3 7 8 -- 0 . 0 0 6 7 1 9 6= 0 . 0 0 6 7 2 1 -- 0. 0 0 8 0 6 2 7= 0 . 0 0 8 0 6 5 -- 0. 0 0 9 4 0 6 8= 0. 0 0 9409 -- 0 . 0 10 7 5 0 9= 0. 0 10752 -- 0. 0 1 2 0 9 3 10= 0 . 0 1 2 096 -- 0. 0 13437 11= 0 . 0 1 3 4 4 0 - 0. 0 14 78 1 12= 0.0 14784 -- 0. 0 16 12 5 13= 0 .0 16 12 7 -- 0. 0 174 68 14= 0 .0 1747 1 -- 0 . 0 188 12 15= 0.0 188 15 -- 0. 0 2 0 156 16= 0. 020 159 -- 0 . 0 2 1 500 17= 0 . 0 2 1 5 0 2 -- 0. 0 2 2 8 4 3 18= 0. 0 2 2 8 4 6 -- 0. 0 24 187 19= 0. 024 19 0 -- 0 . 0 2 5 5 3 1
i. OF PLATES 463
AVERAGE Sq mm PLATE SIZE 0.000996
$= PERCENTAGE OF PLATES IN EACH CATEGORY
NUMB Ei OF PA RTICLES
vaMmmmmmoxi
6 7 8 9 10 II 12 (SEE EXPLANATION ABOVE)
Mxu9HvaMa*BiamBi JL
13 14 IS 16 17
18 19 3.6
PLOT OF LENGTH/W IDTH RATIOS FOR TH E
b*w Wt
Ulti l j L i I n i .
PLATY P H A S E OF S A M P L E VERMONT- J ULY, 1970
EXPLANATION (AREA S<? rom)
1= 0 - 0 . 0 0 1 3 4 3
2= 0 . 0 0 1 346 " 0. 0 0 2 6 8 7 3= 0. 0 0 269 0 " 0. 0 0 40 3 1 200 4= 0 . 0 0 4 0 3 4 -- 0. 0 0 5 3 7 5 5= 0 . 0 0 5 3 7 8 --' 0 . 0 0 6 7 1 9 6= 0 . 0 0 6 7 2 1 -- 0 . 0 0 8 0 6 2 7= 0 . 0 0 8065 " 0. 0 0 9 4 0 6 8= 0. 0 0 S409 -- 0 . 0 10 7 5 0 9= 0. 0 10752 -- 0. 0 1 2 0 9 3 10= 0 . 0 1 2 096 -- 0. 0 13437 11= 0 . 0 1 3 4 4 0 -- 0. 0 14 7 8 1 12= 0. 0 14784 -- 0. 0 16 12 5 13= 0. 0 16 127 -- 0. 0 I 74 68 14= 0. 0 1747 1 -- 0 .0 188 12
15= 0.0 188 15 -- 0. 0 2 0 156 16= 0. 0201 59 -- 0 . 0 2 1 5 0 0 17= 0 . 0 2 1 5 0 2 -- 0. 0 2 2 8 4 3 18= 0. 0 2 2 8 4 6 -- 0. 0 24 187 19= 0. 024 19 0 -- 0. 0 2 5 5 3 1
TOTAL No. OF PLATES 4 46 AVERAGE Sq mm PLATE SIZE 0.002661
iOO PERCENTAGE OF PLATES IN EACH
CATEGORY
NUMI A OF PA RTICLES
0% 0.4% p.4%o.2%0.2% 0 % 02% 0.2%
6 7 6 9 IO II 12 13 14 15 16 17
(SEE EXPLANATION ABOVE)
18 19 18-
PLOT OF LENGTH /WIDTH RATIOS FOR T H E
NUMBL.. OF PARTICLES
OF SIZ E DISTRIBUTION (Sq mm) OF T HE PLATY P H A S E OF S A M P L E . V E R M ONT-SEPTEM BER, 1970
EXPLANATION (AREA Sq mm)
1= 0 - 0 . 0 0 1 3 4 3 2= 0 . 0 0 1 346 - 0 .0 0268 7 3= 0 . 0 0 2 6 9 0 -- 0. 0 0 40 3 1
200 4= 0 . 0 0 4 0 3 4 -- 0. 0 0 5 3 7 5
5= 0 . 0 0 5 3 7 8 -- 0 . 0 0 6 7 1 9 6= 0 . 0 0 6 7 2 1 -- 0 . 0 0 8 0 6 2 7= 0 . 0 0 8065 -- 0. 0 0 9 4 0 6 8= 0. 0 0 9409 -- 0.0 10750 9= 0 . 0 10752 -- 0. 0 1209 3 10= 0 . 0 1 2 096 -- 0. 0 1343 7 11= 0 . 0 13 4 4 0 -- 0. 0 14 78 1 12= 0 . 0 14784 -- 0. 0 16 12 5 13= 0 . 0 16127 -- 0. 0 174 68 14= 0 . 0 1747 1 -- 0.0 188 12 15= 0.0 188 15 -- 0. 0 20 156 16= 0 .0 2 0 1 59 -- 0 .0 2 1 500 17= 0.021 5 0 2 -- 0. 0 2 2 8 4 3 18= 0. 0 2 2 8 4 6 -- 0. 0 24 I 67 19= 0. 024 19 0 -- 0. 0 2 5 5 3 1
>. OF PLAT ES 4 34
AVERAGE Sq mm PLATE SIZE 0.00 193 9
100 # = PERCENTAGE OF PLATES IN EACH
CATEGORY
NUMBER OF PARTICLES
0.5/<
6 7 8 9 10 II 12 (SEE EXPLANATION ABOVE)
16 17 18 19
NUMBER OF PARTiCLES
PLOT OF S IZ E DISTRIBUTION (Sq mm) OF THE PLATY P H A S E OF SA M P LE VERMONT-NOVEMBER, 1970
EXPLANATION ( A R EA Sq mm)
1= 0 - 0.001343
2= 0.001 346 - 0. 0 02687
3= 0. 002690 -- 0. 004031 aoo 4- 0.004034 -- 0. 005375
5= 0.005378 -- 0.006719
6= 0.006721 -- 0.006062 7= 0 . 0 0 8065 -- 0.00S406
8= 0. 0 0 9409 -- 0.0 10750
9= 0. 0 10752 -- 0. 0 12093
10= 0.012 096 -- 0. 0 13437
11= 0.013440 -- 0. 0 147 8 1 12= 0.0 14784 -- 0. 0 16 12 5
13= 0.0 161 27 -- 0.0 17466
150
14= 0. 0 747 1 -- 0.0 188 12 15= 0.0 188 15 -- 0. 020 156
16= 0. 0201 59 -- 0.021 500
17= 0.021502 -- 0. 0 22843
18= 0. 022846 -- 0. 0 24 i 87
19= 0. 024 19 0 -- 0. 02553 1
TOTAL No. OF PLATES 4 5 2
AVERAGE S q mm PLATE SIZE 0.002458
100 PERCENTAGE OF PLATES IN EACH
CATEGORY
NUMBER OF PARTICLES
0.4% 07o 0.2% 0.4% o/c 0% 0.2%
6 7 8 9 IO II 12 13 14 15 16 (SEE EXPLANATION ABOVE)
cA...cJLw-a
17 18
19 ZZ
r'LA i 1 r'iiMijh vi oM irjfLc v uiU iivh i unhUAlt ?
EXPLANATION (AREA Sq mm)
1= 0 - 0 . 0 0 1 3 4 3 2= 0 . 0 0 1 3 4 6 - 0. 0 0 2 6 8 7 3= 0 . 0 0 2 6 9 0 -- 0. 0 0 4 0 3 1 4= 0 . 0 0 4 0 3 4 -- 0. 0 0 5 3 7 5 5= 0. 00537-8 " 0. 0 0 6 7 1 9 6= 0 . 0 0 6 7 2 1 -- 0. 0 0 8 0 6 2 7= 0 . 0 0 8065 -- 0. 0 0 9 4 0 6 8= 0. 0 0 9 4 0 9 -- 0 . 0 10 7 5 0 9= 0. 0 10752 -- 0. 0 12093 10= 0 . 0 1 2 096 -- 0. 0 13437 11= 0 . 0 1 3 4 4 0 -- 0. 0 14 78 1 12= 0. 0 147 84 -- 0. 0 16 12 5 13= 0 . 0 16127 -- 0 . 0 17468 14= 0. 0 1747 1 -- 0 . 0 188 12 15= 0.0 188 15 -- 0. 0201 56 16= 0. 0 2 0 159 -- 0 . 0 2 1 5 0 0 17= 0. 021 5 0 2 -- 0. 0 2 2 8 4 3 18= 0. 0 2 2 8 4 6 -- 0. 0 24 187 19= 0. 024 19 0 - 0 . 0 2 5 5 3 1
TOTAL No. OF PLA T ES 4 4 6 AVERAGE Sq mm PLATE SIZE 0.002776
#= PERCENTAGE OF PLATES IN EACH CATEGORY
N tT '^ E R OF PARTICLES
4.0%
2.0 % 2.0 %
0.4% 0.4% 0.4% po/
" - 9 --- 7
7 8 9 IO II 12 13 14 15 16 17 18 19
(SEE EXPLANATION ABOVE)
24
PLOT OF LENGTH/WIDTH RATIOS FOR THE
NUM3E OF PARTICLES
200
150
100
t' LMi i Kn A b e w1 v;imir Li*
EXPLANATION (AREA Sq mm)
i= 0 - 0.001343 2= 0 . 0 0 1 3 4 6 - 0. 0 0 2 6 8 7 3= 0. 0 0 2 6 9 0 -- 0. 0 0 4 0 3 1 4= 0 . 0 0 4 0 3 4 -- 0. 0 0 5 3 7 5 5= 0.0051378 -- 0 . 0 0 6 7 1 9 6= 0 . 0 0 6 7 2 1 -- 0. 0 0 8 0 6 2 7= 0 . 0 0 8065 -- 0. 0 0 9 4 0 6 8= 0. 0 0 9409 -- 0 . 0 i 0 7 5 0 9= 0. 0 1 0752 -- 0. 0 1209 3 10= 0 . 0 1 2 096 -- 0. 0 13437 11= 0 . 0 1 3 4 4 0 -- 0. 0 14 7 8 1 12= 0 . 0 1 4 7 8 4 -- 0. 0 16 12 5 13= 0 . 0 16127 -- 0. 0 174 68 14= 0 . 0 1 7 4 7 1 -- 0 . 0 188 12 15= 0. 0 18 8 15 -- 0. 020 15 6 16= 0 . 0 2 0 1 59 -- 0 . 0 2 15 0 0 17= 0. 021 502 -- 0. 0 22 843 18= 0. 0 2 2 8 4 6 -- 0. 0 24 18 7 19= 0. 024 19 0 -- 0. 0 2 5 5 3 1
TOTAL No. OF PL A T E S 4 30
AVERAGE Sq mm PLATE SIZE 0.002439
# = PERCENTAGE OF PLATES IN EACH CATEGORY
NU SVlciR OF PARTICLES
1.2% 09% ^ 0 %
<30/ ri oo 0% 0% 0% 0% 0<2/o0 % 0% 0% 0 % a 2 i
iiiiwu r.
11
-I -
I
il -- l --
^ -------- --------------------------------- if-- ^ i i n aw i ww i-fj fii il I M m u l^ "r- rrf<:Cn = ^
6 7 8 9 IO II 12 13 14 15 16 17 18 19
(SEE EXPLANATION ABOVE)
. '
1 OF PARTICLES
uW I
u b i V i l i / t V t> i t I l l M I l e w
I v - n i l i I fc
200 150
100
PLOT OF SIZ E DISTRIBUTION (Sq mm) OF THE PLATY P H A S E OF S A M P L E V E R M O N T -- MAY, 1971
E X P L A N A T I O N ( A R E A Sq mm)
1= 0 - 0 . 0 0 1 3 4 5 2= 0 . 0 0 1 3 4 6 - 0. 0 0 2 6 8 7 3= 0 . 0 0 2 6 9 0 -- 0. 0 0 4 0 3 1 4= 0 . 0 0 4 0 3 4 -- 0. 0 0 5 3 7 5 5= 0 . 0 0 5 3 7 8 -- 0 . 0 0 6 7 1 9 6= 0 . 0 0 6 7 2 1 -- 0. 0 0 8 0 6 2 7= 0 . 0 0 8065 -- 0. 0 0 9 4 0 6 8= 0. 0 0 9409 -- 0 . 0 10 7 5 0 9= 0. 0 10 7 5 2 -- 0. 0 12 0 9 3 10= 0 . 0 1 2 09 6 -- 0. 0 13437 11= 0 . 0 1 3 4 4 0 -- 0. 0 14 7 8 1 12= 0 . 0 1 4 7 8 4 -- 0. 0 16 12 5 13= 0 . 0 1 6 1 2 7 -- 0 . 0 1 7 4 6 8 14= 0 . 0 17 4 7 1 -- 0 . 0 188 12 15= 0 . 0 1 8 8 15 -- 0. 0 2 0 i 5 6 16= 0 . 0 2 0 1 59 -- 0 . 0 2 1 5 0 0 17= 0. 021 5 0 2 -- 0. 0 2 2 8 4 3 18= 0. 0 2 2 6 4 6 -- 0. 0 24 187 19= 0. 024 19 0 -- 0. 0 2 5 5 3 1
TOTAL No. OF P L A T E S 4 35 AVERAGE Sq mm PLATE SIZE 0.002351
PERCENTAGE OF P LAT ES IN EACH CATEGORY
N U M B E R OF P A RT IC L E S
% n% 9'7/o 0.2% 0.2%
= $ -- .L
4 5 6 7 8 9 IO II 12 IS 14 ` 15 16 17 18 19
(SEE EXPLANATION ABOVE)
Z&1
C O L O R A D O S C H O O L O F M I N E S 'R E S E A R C H I N S T I T U T E
These plots show;
1. The siz e d is trib u tio n c u rv e s show th a t the Lot No. 2 G ran th am p ro d u c t p o sse sse s the la rg e s t am ount of fine m a te ria l and the V erm ont products the sm a llest am ount of fine m a te ria l.
2. The ra tio c u rv e s show the Ita lia n and V e rm o n t p ro d u cts to be c o m p a ra b le in p a rtic le shape, and the Lot No. 2 G rantham to be slightly m ore elongate.
The d istrib u tio n of platy particles""below 0. 001343 sq m m in the
3 4 4 -L* Ita lia n O. S ., Ita lia n U. S . , and th e L ot No. 2 G rantham sa m p le s w e re
then determ ined to m o re clo sely define the sup erfin e portion of each sam ple.
Following are the re su lts of that study;
. TABLE 4 P e rc e n t of P la te s in C ate g o rie s Below 0. 001343 sq m m
Sam ple ________
% on a to tal sam ple b a sis (sq mm)
<0.0001 0 .0 0 0 1 -0 .0 0 0 5 0 .0 0 0 5 -0 .0 0 1 0 0. 0010-0. 001343
344- L Ital. U. S.' Ita l. O. S.
1.4 6. 8 7. 0
7. 2 25.4 23.4
13. 1 12. 8 18.4
10. 1 4. 8 6. 2
Lot No. 2 G rantham 5. 6
34. 8
23.8
10. 0
T h e se r e s u l t s show th a t the 3 4 4 -L sa m p le had the s m a lle s t p e rc e n ta g e of p a rtic le s below 0. 0001 sq m m in size, and the Italian sam p les had the la r g e s t p e rc e n ta g e of p a rtic le s below 0. 0001 sq m m in size. T he Lot No. 2 G ra n th a m and the Ita lia n sa m p le s show ed the la r g e s t p ercen tag e of
29
COL OR AD O S CHOOL OF MINES R E S E A R C H I NSTI TUTE
p a rtic le s in the 0. 0001-0. 0005 sq m m 'size ra n g e . The Lot No. 2 G rantham
sa m p le showed the la r g e s t p e rc e n ta g e of p a rtic le s in th e 0. 0005-0. 0010 sq mm
size range. Talc Shards
t
Length/w idth ratio and size distribution data w ere procured on the
p a r tic le s identified as ta lc s h a r d s in sa m p le s 3 44-L , Ita lia n U. S ,, Italia n
O. S ., and Lot No. 2 G rantham . Follow ing a re the re s u lts of that study:
TABLE 5
N um ber of Talc Shard P a rtic le s F alling Into Length/W idth Ratio C ategories
Sam ple
_______________________ R atio L en g th /W id th ______________ _ 0- 2- 4 - 6- 8- 10- . 12- 14- 16- 18- 20- 22- 242 4 6 8 10 12 14 16 18 20 22 24 26
344- L
39561 1 1 00 0 0 00
I t a l . U. S. 0 0 7 6 4 3 2 2 0 0 0 1 1
Ita l. O. S. 0 0 2 ,12 8 2 0 0 0 0 0 0 0
_ 'L ot No. 2 G rantham 3 6 6 0 0 0 0 0 0 0 0 0 0
The m o st significant trend noted from th ese data was that the Italian O. S. p ro d u c t had s h a rd s fallin g w ithin a r a t h e r r e s tr ic te d len g th /w id th r a tio ra n g e , i. e, 4 -1 2 , w hile the Italia n U. S. p ro d u c t had sh a rd s that ran g e d in len g th /w id th ra tio fro m 4-26. It is p o ssib le that this could indicate different grinding procedures.
30
C O L O R A D O S C. HOOL OF Ml N S R E S E A R C H I N S T I T U T E
TABLE 6
Num ber of Talc Shard P a rtic le s F allin g Into Size C ategories
Sam ple
_________________________ Size (sq mm)______________________ 0-0.0001 0.0001-0.0005 0.0005-0.0010 0.0010-0.0015
344-L
4
6
4
0
Ita l. U. S. ItaL O. S.
9 9
12 12 ' r
5 3
0 0
Lot No. 2
G rantham
7
8
0
0
T hese data show the talc sh a rd s in Italian products to be esse n tia lly
id en tica l in re g a rd to p a rtic le siz e . The Lot No. 2 G rantham talc sh a rd s a re
concentrated near the finer size end.
Talc Needles
*
Since m o st of the n eed les in the sam ples had a width of 0. 00164 mm,
it w as decided to exam ine only the rela tio n sh ip of needle length. The following
ta b le shows the co m p ariso n of talc needle length in each sam ple;
TABLE 7
N um ber of Talc N eedles in Each Length Range
Sam ple
00. 0082
N eedle Length (mm)
0. 0082- 0. 0164- 0. 0246- 0.0 3 2 8 0. 0164 0. 0246 0. 0328 0.0410
0. 0410 0. 0492
344-L Ita l. U, S. Ita l. O. S.
3 1 1
6 2 1
10 31 11
10 00 00
Lot No. 2 G rantham
1
2
21
0- 0
T hese data show that the 3 4 4 -L sam p le has the g re a te s t num ber of
talc needles, the m ajo rity of which fa ll in the 0. 0082-0.0164 m m length
range. The other sam ples show no tren d s other than the needle lengths
a ll fa ll below 0. 03 28 m m .
- Nontalc Needles
' ss
As in the talc needle category, all of the nontalc needles had a rath er
u n ifo rm w idth of about 0. 00164 mm, th e r e f o r e the needle len g th re la tio n s h ip s
w ere exam ined. The following table outlines the nontalc needle lengths in
each sam ple.
TABLE 8
N um ber of Nontalc N eedles in Each Length Range
Sam ple
N eedle Length (mm)
0 - 0 .0 0 8 2 - 0 .0 1 6 4 - 0. 0246- 0. 03280 .0 0 8 2 0.0164 0. 0246 0. 0328 0. 0410
0. 0410' 0. 0492
344-L
01
2
0
0
0
Ita l. \U. S. Ita l. O. S.
0 1
1c 0
1 1
00 00
0 0
Lot No. 2 2
2
0
10
0
G rantham
T hese data show the Lot No. 2 G rantham to have the g re a te s t amount of n o n talc n e e d le s . T he m a jo rity of th e n e e d le s in all of th e sa m p le s fa ll in size ra n g e s below 0. 0246 m m . .
32
\
AI C O L O R A D O S C H O O L O F M I N E S R E S E A R C H I N S T I T U T E
'l
;,''Q uartz Most of the quartz p a rticle s were n early equidim ensional, th erefore
j it was decided to exam ine the rela tio n sh ip s of a re a in sq m m betw een sam ples.
The following table shows the relatio n sh ip of quartz p article size in each sam ple:
0 1 3
*
3 3 3
TABLE 9
N um ber of Q uartz P a rtic le s F allin g Into Size R anges
Sam ple
sq mm 0- 0.00001- 0.000050.00001 0.00005 0.00010
0.000100.00050
0. 000500.00100
344-L
0
3
1
3
2
Ita l. U. S. 0
10
0
0
Ita l. O. S. 0
2 ' '0
0
0
Lot No. 2 G rantham 0 0 0
00
1 These data indicate that the 3 44-L sample' contains the m ost quartz, and th at a m a jo rity of the sam p le h a s a re a s ran g in g from 0. 00001-0. 0005 sq
3 mm. V ery little quartz was noted in the Italian sam ples; the p a rtic le s that
3 w ere noted fe ll into the 0. 00001-0. 00005 sq m m ran g e. No q u a rtz w as \ \ noted in the Lot No. 2 G rantham sam ple.
3
-tr
a
33
C O L O R A D O S C H O O L OF M I N E S R E S E A R C H I NS T I T UT E
C arb o n ate Again, a s in the c a s e of the q u a rtz g ra in s , m o st of the carb o n ate g rain s
w ere n early equidim ensional, th ere fo re , a co m p ariso n of th eir a re a s in sq m m was m ade. The following table outlines the re s u lts of that study:
TA BLE 10
N um ber of C arbonate P a rtic le s in E ach Size Range
Sam ple
__ ______________________ _________ sq m m ____________________ __ 0- 0.00001- 0.00005- 0.00010- 0.00050 - 0.00100- 0.00500 0.00001 0.00005 0.00010 0.00050 o .o o io o O'. 00500 0.01000
344-L
00
4
2
0
10
Ital. U. S.
0
5
12
111
\
Ita l. O. S.
0
0
0
10
10
Lot No. 2
G ran th am
0
0
0
0
10
0
T h e se d a ta show the Ita lia n U. S. sa m p le s to have th e la r g e s t n u m b er of carbonate p a rtic le s and also to have the la rg e st num ber in the sm allest size range.
" O th e r11 P a r t ic le s * P a rtic le s cla ssified as "o th e r" w ere g en erally very sm all and generally
equidim ensional. B ecause of the equidim ensional aspect, the areas, in sq mm, of th ese p a rtic le s in each sam ple w ere com pared. The following table outlines the re su lts of that study:
34
CO LO R A 0 0 S C H O O L OF M I N E S R E S E A R C H I N S T I T U T E
T A B L E 11
N um ber of "O th er" P a rtic le s in E ach S ize Range
Sam ple
00.000001
0.0000010.000005
sq mm 0.000005- 0 .000010.000010 0.000050
0.000050 0.000100
344- L
16
3
5
0
ItaL U. S.
0
6
1
1
0
Ita l. O. S.
0
9
0
10
Lot No. 2
G rantham
0
7
1
1
0
As m ay be noted from th ese data, a m ajority of the "other" p articles in th e Italia n and Lot No. 2 G rantham .^sam ples fa ll into the 0. 000001-0. 000005 sq m m range, In the 344-L sam p le the m ajo rity of the p a rtic le s fall in the 0. 000001 to 0. 000050 sq m m ran g e .
35
,M -,
iK 'V T 'V '-rfrzi.
C olorado
School of vnes R esearch
P. O. Box 112 G o l d e n , C o l o r a d o 80401
I n stitu te
July? , 1971'
M r. W m. H. A shton
Johnson &Johnson R esearch Center
1 i/ ;
R e se a rc h and D evelopm ent
New Brunsw ick, NJ 08901
3 90517
D ear M r. Ashton:-
Follow ing are the re s u lts of the x ray analyses on the 344-L V erm ont talc product and the six monthly V erm ont talc product sam ples.
Sum m ary and Conclusions
Sem iquantitative x -ra y d iffractio n a n aly ses of the V erm ont products and standard m ineral sam ples indicate that essen tially no anthophyllite and only m in o r am ounts (below 1%), of tre m o lite and actin o lite w e re d e te c te d . O ther nontalc phases noted in the V erm ont talc sam ples w ere sm all amounts of m ica, ch lo rite, m ag n esite, dolom ite, and m inor to tra c e am ounts of quartz.
D iscussion
F ig u re 1 shows tracin g s of x -ra y diffractogram s of the 344~L V erm ont talc product and 6 m onthly V erm ont talc products. The column at the left of the tr a c in g s in d ic ate the p o sitio n s of th e d iffra c tio n peaks of e ac h noted m in e ra l type. As m ay be noted from these tracin g s only very m inor trem olite actinolite and no recognizable anthophyllite peaks are present.
The follow ing tab le shows the re la tiv e peak heights of the m ajo r peak of each m ineral species identified.
Air. f m , H. A shton Johnson &Johnson CSMRI P ro je c t No. 390517 P age 2 _________________
TABLE 1 R elative P eak Heights
R elative Peak Heights T rem . Antho Sample Talc Act. phyllite M ica C hlorite M agnesite Dolom ite Quart
344-L m ajor trace
5. 0 4. 0
4. 0
2. 0
2. 0
Alay 71
trace
- 10. 5
7. 0
5. 5
-
2.0
M a r 71 !1
18. 0 15. 5
7.0
5. 0
2. 0
J a n 71
II
3
- 10. 0
6. 5
6. 5
3. 0
2.5
Nov 71 If
trace
- 5. 0
4. 5
5.0
3. 0
Sept 71 II
3
6. 5
6. 5
5. 5
2. 0
1. 0
J u ly 71 II
trace
- 13. 0
9 5
6. 5
3. 0
-
It m ust be rem em b ered that peak heights of different m ineral species cannot be com pared, i. e ., m ica vs chlorite, etc. P eak heights of the sam e m ineral sp ecies can be co m pared in a re la tiv e m an n er. A lso the peak heights them selves in no w ay indicate percen t.
The following table gives the peak heights of standard sam ples of trem o lite, actinolite, anthophyllite and quartz.
TABLE 2
P eak Heights of Standard Samples
P eak Height
T rem oliti A ctinolite A n th o p h y llite Q uartz
180 280 /250 '5 00
iil-rifr*l h i Ji
..hlfJji
M r. Wm. H. A shton Johnson &Johnson CSMRI P ro je ct No. 390517
P ag e 3_____________________ __________________________ ________________________
The peak heights noted in T able 1 can be com pared to th ese standard peak heights to produce a sem iquantitative estim ate of percentages. By com paring th e peaks noted in T able 1 w ith the peak h eig h ts of the sta n d a rd s in T ab le 2, it is evident that the quartz, trem o lite-actin o lite and anthophyllite phase all a p p e a r to fa ll w ell below the 1% ran g e .
Table 2 shows the re s u lts of x -ra y diffraction analysis on a 344-L sam ple to which 1% of the tre m o lite sta n d a rd had been added;
TABLE 3
R elative P eak Heights of a 344-L Sample W ith 1% T re m o lite S tandard Added
Talc m ajor
T re m . - A nthoAct. phyllite
4.0
M ica 5.0
C hlorite 4 .0 '
M agnesite 4. 0
D olom ite
2.0
Q u artz
2.0
Sincerely,
M. G. P atten g ill P ro ject Engineer Mining Division
/laj Attach. F igure 1