Document 3N01oDJeqYy2rDb2d1269JNXn

A O f'-,. t ; I N j gwiVt *.*/.' *vou Cmi4 September 16, 1970 Mr. Jama* F. Morgan . I. duPont dc Nemours a Company Employee Relations Department Wilmington, Delaware 19691 Daar Mr. Morgan: It was a pleasure haaring from you. I am particularly intri gued by the identification of Srunarite m what I presume is a dust sample at one of your locations'. Cruncrite is an amphibole which in most mineralogy books is indicated as being fibrous or columnar. We do not normally regard it as a member of the asbestos family of amphiboles sinee it is I- harm that it does not yield a "fn-rous" product. . Under separate cover * am sending to your .ttencion a sample of Curmrgtonite schist from the Home*take Mining Company in Lead. South Dakota. This material has been identified by us as Grunente with a slighe impurity. Attached are the approx imate analyses and an electron micrograph of the material. Confirming our diseussion at Philadelphia, we would be very glad to discuss with you at any time your program in connection with employee exposures'to asbestos fiber duet and offer any aaaiatanee based on our long experienco In this field. very tpuly yours. / Dr./Sidney Spoil, Director Corporate, Mining i Ripe Divisions SS/re DUP 0901615 DU 023012 Mr. T-mes r. Morgan C. I. duront Attachrcnt September If., 107 0 Antlyaeg of Grunonte Stmpli- Sample Description; Cuming tonite Sehist from - liomesttK* Mining company Land, South Oaxaca Sampla Mo. 3647-152-1 x-rav Idantifieaclom Grunarite yiq) j fill) 2 Si2'J and a craca of cl.loriti . Petrographic; Major - amphiboia mineral wit:-, optical proper'.!- close to grunentc. a raur-par of ti-.t cunmtngtorne* scries. Minor - chlorito Spactroqraphlc: Major - iron, magnesium, silicon Minor High - aluminum (5-10%) Minor Lev - calcium (1-S%) Small ( * 1%) - manganese, sodium Very Small - chromium, copper, titanium, zirconium ( < 0.1%) Electron Micrograph 1 Attached .1 : S. tpail DUP 0901616 DU 023013