Document RJNyV3QyDzaJkny3O2Y04k23z
FILE NAME: Talc (TALC)
DATE: 1971 Sept 29
DOC#: TALC430
DOCUMENT DESCRIPTION: Letter to Desert Minerals, Inc. From American Conference of Govt Industrial Hygienists
...1 O h.,t
;) M 0 . V* CTW ff**
***N*
' .
. , V to.
.
-
!>;*.n#
V , ; h v* '
** (<! ..*. . S f U f l
^ir m
AMERICAN CONFERENCE
".
V '...
of
: '
GGVSRNMENTAl INDUSTRIAL HYGIENISTS
^n0y
September 29, 1971
frt , . -
'fU ff
'A e g ifts fv
.
ty
.. -
.
;
> K > - `V-V AC ;
v iM v
H ftrtr' ' '
* > * * '/ . . - - i ... b> t p * 1 *
Pr<*;.) hMi/>tr '**
Mr. E* J . E l ls w o r t h
Desert Minerals, Inc, : . '
'
i0 9 i South Coast Highway
Laguna. Beach, C a l i f o r n i a 92651
Dear Mr,. E l l s w o r t h ;
., "" ' ,
.
i . .
in answer to your l e t t e r of September 22 regarding a tnineralogic d e f in itio n
d i t f e r e n t i a t i n g between f i b r o u s and n o n - a s h e s ti f o r m TALC, I am p le a s e d
to quote from a v e ry r e c e n t a r t i c l e t h a t appeared in S cience. September 1?.
1971..:." ;
, -
. ...
----- ------:
"There is no firm m lneralogie d e f in itio n of commercial talc,
and in moat a r e a s th e m in e r a l Calc, forms much le s s th an h a lf
o f commercial t a l c . The com position o f commercial t a l c v a rie s
with the d e p o sit. Vermont mines produce a p la ty or granular '
type o f m in e r a l r e l a t i v e l y f r e e o f a s b e s t o s m i n e r a l s ( 1 ) . New
York and C a l if o r n ia ta lc s , c o n ta in more f ib ro u s s i l i c a t e s ,
: in clu d in g a n th o p h y llite and tr c m o lite ( 2, 5 ) , "
R efe re n c e l r e f e r s 'to?W eiss and Boehner, Arch. E n v iro n . H e a lth 111, 30h ( I 9&7 ).
Reference 2 r e f e r s to Wright, Talc and Soapstone, C a lif . Divn. of Mines
Pub., B u l l , I 76, San F r a n c is c o , 1957* R e fe re n c e 3 r e f e r s t o W ells, M in e r a l
F a c ts and Problems,. U.S. Bu. of Mines, Washington, D.C., 1965.
4
'
.
;. ; .
..
'
.
' ' V
..
Sincerely youre,
.
;: a !. ( \'v-i r ; v ; 1; Vv^NVCfeUil'T''
H erbert E. Stokinger, .Sh.D.
Chairman
' 1
. Threshold Limits Committee
;: -:
. .
,D ju; f&f. Tfcrt'f(.-yt- .
CRMC-HT-TALC-000105