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Types of asbestos
Crocidolite (Blue Asbestos)
Asbestiform Riebeckite, Na2Fe3+2Fe2+3[Si8 O22](OH)2
Crocidolite asbestos was the least used in commercial products. Approximately 10% of the asbestos used in the United States was crocidolite.
Crocidolite is the asbestiform variety of riebeckite. Riebeckite is the name used for minerals of the glaucophane-crossite-riebeckite series in which iron is predominant over magnesium and aluminum. Crocidolite is called the "Blue Asbestos", because it is strongly pleochroic, ranging from Prussian blue and indigo blue to yellow green.
The characteristic form of crocidolite is similar to that of chrysotile. The fibers generally resemble strands of fine textured hair and are slightly more brittle than chrysotile, but can usually bend beyond 90 degrees before breaking. Typically curved, hairlike, but straight fibers and bundles may also be found. Riebeckite cleavage fragments may be found in association with true asbestiform bundles. Crocidolite is harder than the other varieties of amphibole asbestos.
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