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Relationship of Mineral Habit to Size Characteristics for Tremolite Cleavage Fragments and Fibers.

PB300364

Publication Date	1979
Personal Author	Campbell, W. J.; Steel, E. B.; Virta, R. L.; Eisner, M. H.
Page Count	26
Abstract	The Bureau of Mines report describes a study conducted to determine the relationship of mineral habit to particle size and shape characteristics for prismatic, acicular, fibrous, and asbestiform varieties of tremolite. Particle measurements were made with the petrographic microscope at X 1,250 and the scanning election microscope at magnifications up to X 10,000. All of the varieties of tremolite, upon Wiley milling, produced a significant percentage of particles that meet the Federal regulatory criteria for counting as asbestos fibers. However, only the asbestiform variety gave milled particles that fell into a size range of >10 micrometers in length and <0.5 micrometer in width; some medical scientists consider this range significant for production of adverse health effects.
Keywords	Amphiboles Cleavage Fibers Asbestos Petrography Particle size Tremolite
Source Agency	Bureau of Mines
NTIS Subject Category	48F - Geology & Geophysics
Corporate Authors	Bureau of Mines, Avondale, MD. Avondale Metallurgy Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations.
NTIS Issue Number	197926

Relationship of Mineral Habit to Size Characteristics for Tremolite Cleavage Fragments and Fibers.

Relationship of Mineral Habit to Size Characteristics for Tremolite Cleavage Fragments and Fibers.
PB300364

Publication Date	1979
Personal Author	Campbell, W. J.; Steel, E. B.; Virta, R. L.; Eisner, M. H.
Page Count	26
Abstract	The Bureau of Mines report describes a study conducted to determine the relationship of mineral habit to particle size and shape characteristics for prismatic, acicular, fibrous, and asbestiform varieties of tremolite. Particle measurements were made with the petrographic microscope at X 1,250 and the scanning election microscope at magnifications up to X 10,000. All of the varieties of tremolite, upon Wiley milling, produced a significant percentage of particles that meet the Federal regulatory criteria for counting as asbestos fibers. However, only the asbestiform variety gave milled particles that fell into a size range of >10 micrometers in length and <0.5 micrometer in width; some medical scientists consider this range significant for production of adverse health effects.
Keywords	Amphiboles Cleavage Fibers Asbestos Petrography Particle size Tremolite
Source Agency	Bureau of Mines
NTIS Subject Category	48F - Geology & Geophysics
Corporate Authors	Bureau of Mines, Avondale, MD. Avondale Metallurgy Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations.
NTIS Issue Number	197926