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Phase Relationship of Talc and Amphiboles in a Fibrous Talc Sample.

PB85185270

Publication Date	1985
Personal Author	Virta, R. L.
Page Count	20
Abstract	The Bureau of Mines examined a fibrous talc sample from the Gouverneur talc district in New York by transmission electron microscopy (TEM) and polarized light microscopy to determine the mineralogical relationship of the fibrous talc to the amphiboles present in the sample. Because of various characteristics, phase contrast microscopy and a provisional TEM technique for monitoring asbestos exposure would not distinguish between fibrous talc and fibrous amphiboles. TEM techniques employing electron diffraction and energy-dispersive X-ray analysis are recommended to positively identify the fibrous phases for regulatory purposes.
Keywords	Amphiboles Talc Fibers Chemical analysis Crystal structure Asbestos Sampling X ray diffraction New York Exposure Environmental health Transmission electron microscopy Anthophyllite Tremolite Health hazards Talcville(New York) Saint Lawrence County(New York)
Source Agency	Bureau of Mines
NTIS Subject Category	48F - Geology & Geophysics 68G - Environmental Health & Safety 57U - Public Health & Industrial Medicine 99A - Analytical Chemistry 99F - Physical & Theoretical Chemistry
Corporate Authors	Bureau of Mines, Avondale, MD. Avondale Research Center.
Supplemental Notes	Library of Congress catalog card no. 84-600272.
Document Type	Technical Report
Title Note	Rept. of investigations/1985.
NTIS Issue Number	198516

Phase Relationship of Talc and Amphiboles in a Fibrous Talc Sample.

Phase Relationship of Talc and Amphiboles in a Fibrous Talc Sample.
PB85185270

Publication Date	1985
Personal Author	Virta, R. L.
Page Count	20
Abstract	The Bureau of Mines examined a fibrous talc sample from the Gouverneur talc district in New York by transmission electron microscopy (TEM) and polarized light microscopy to determine the mineralogical relationship of the fibrous talc to the amphiboles present in the sample. Because of various characteristics, phase contrast microscopy and a provisional TEM technique for monitoring asbestos exposure would not distinguish between fibrous talc and fibrous amphiboles. TEM techniques employing electron diffraction and energy-dispersive X-ray analysis are recommended to positively identify the fibrous phases for regulatory purposes.
Keywords	Amphiboles Talc Fibers Chemical analysis Crystal structure Asbestos Sampling X ray diffraction New York Exposure Environmental health Transmission electron microscopy Anthophyllite Tremolite Health hazards Talcville(New York) Saint Lawrence County(New York)
Source Agency	Bureau of Mines
NTIS Subject Category	48F - Geology & Geophysics 68G - Environmental Health & Safety 57U - Public Health & Industrial Medicine 99A - Analytical Chemistry 99F - Physical & Theoretical Chemistry
Corporate Authors	Bureau of Mines, Avondale, MD. Avondale Research Center.
Supplemental Notes	Library of Congress catalog card no. 84-600272.
Document Type	Technical Report
Title Note	Rept. of investigations/1985.
NTIS Issue Number	198516