chrysotile


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chrysotile:

see serpentineserpentine
, hydrous silicate of magnesium. It occurs in crystalline form only as a pseudomorph having the form of some other mineral and is generally found in the form of chrysotile (silky fibers) and antigorite and lizardite (which are both tabular).
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chrysotile

[′kris·ō‚tīl]
(mineralogy)
Mg3Si2O5(OH)4 A fibrous form of serpentine that constitutes one type of asbestos.
References in periodicals archive ?
Jean Dupere, president of LAB Chrysotile, called the verdict "a very hard blow for Thetford Mines and Asbestos [town].
2012b) using samples of chrysotile asbestos sediments from a slow-moving landslide on Sumas Mountain, Washington, and from naturally occurring tremolite in El Dorado Hills, California--both areas are of concern due to exposures to local communities.
All 38 of these samples greater than the adopted background surface concentration were due to chrysotile contamination and were collected in 27 separate homes.
Un recent exemple, bien sur, est celui de la garantie de pret de 58 millions de dollars accordee par le gouvernement du Quebec aux investisseurs pour relancer l'extraction de l'amiante chrysotile a la mine Jeffrey, malgre l'opposition et les protestations quasi unanimes des communautes de la medecine et de la sante publique.
HSE recognises that the risks to human health associated with chrysotile are lower than those associated with amphibole asbestos (blue, brown etc) but that does not imply that chrysotile does not cause cancer.
CHRYSOTILE ASBESTOS 47 times safe level' MERCURY Hg' ZINC Zn' COBALT Co' CHROMIUM Cr' ANTIMONY Sb' COPPER Cu' BARIUM Ba' LEAD Pb' MOLYBDENUM Mo' POISON: Yehuda's lethal 9/11 shirt' RAGE: Worried hero Yehuda
This very hard schorl varies from the chrysotile of the Cape of Good Hope only in its paler color, and by the clayrock which serves as its matrix.
Almost all of the asbestos used for fireproofing is chrysotile.
Also in 1993, Collegium Ramazzini, a respected international group of occupational health scientists, refused to review drafts of a IPCS criteria document on chrysotile asbestos which was prepared by "scientists with close ties to the asbestos industry.
For regulatory purposes they are defined as the asbestiform varieties of chrysotile (serpentine), crocidolite (riebeckite), Amosite (cummingtonite-grunerite), anthophyllite, tremolite and actinolite.
USGS reported, 'that 140 metric tons of chrysotile imported in 2011 went into stocks for future use rather than being used because it was unlikely that markets had expanded.
02 Contract Notice (below OJEU threshold): Roof refurbishment works at Fernielea Primary School and Muirfield Primary School comprising removal of existing bitumen felt roof covering (some of which contain Chrysotile asbestos) and replacement with Sarnafil roof covering complete with associated window & rooflight replacement, joiner works, plumbing work and permanent roof edge protection.