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Relationship of Mineral Habit to Size Characteristics for Tremolite Cleavage Fragments and Fibers.
Campbell-WJ; Steel-EB; Virta-RL; Eisner-MH
NTIS: PB 300 364 :18 pages
This 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 electron 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 um in length and <0.5 Um in width; some medical scientists consider this range significant for production of adverse health effects.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 300 364
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division