Selected Silicate Minerals and their Asbestiform Varieties (1977)

W. J. Campbell and four other Bureau of Mines scientists wrote this 1977 information circular to propose common mineral definitions, because analysts, regulators and medical scientists were using asbestos terms inconsistently. Illustrated with photographs and micrographs, it compares chrysotile, crocidolite and amphibole asbestos with their nonasbestiform forms, discusses identification methods, and applies them to air samples near a serpentinite rock quarry and to asbestos in ceiling and wall materials.