Thursday, October 9, 2014

Asbestos - Tremolite-asbestos, California. Asbestos is a term ......

Chrysotile and amphibole asbestos (such as tremolite) occur naturally in certain geologic settings in California, most commonly in association with ultramafic rocks and along associated faults. Asbestos is a known carcinogen and inhalation of asbestos may result in the development of lung cancer or mesothelioma. The asbestos contents of many manufactured products have been regulated in the U.S. for a number of years. For example, the California Air Resources Board (CARB) has regulated the amount of asbestos in crushed serpentinite used in surfacing applications, such as for gravel on unpaved roads, since 1990. In 1998 new concerns were raised about possible health hazards from activities that disturb rocks and soil containing asbestos and may result in the generation of asbestos laden dust. These concerns recently lead to CARB to revise their asbestos limit for crushed serpentinite and ultramafic rock in surfacing applications from 5 percent to less than 0.25 percent, and to adopt a new rule requiring best practices dust control measures for activities that disturb rock and soil containing naturally occurring asbestos.
tremolite-asbestosAsbestos - Tremolite-asbestos, California. Asbestos is a term used for a group of silicate minerals that occur as asbestiform fibers having high tensile strength, flexibility, and heat and chemical resistance. Tremolite is a hydrous calcium magnesium silicate with the chemical formula Ca2Mg5Si8O22(OH)2 . Tremolite can occur in a variety of crystal shapes and sometimes occurs as asbestiform fibers. Click on image for larger view.  
The California Geological Survey (CGS)  provides information on the geology of asbestos occurrences in California to a number of state, local and federal agencies, private industry, consultants and the public. CGS's recent projects related to asbestos  include the following:.....

http://www.conservation.ca.gov/cgs/minerals/hazardous_minerals/asbestos/Pages/index.aspx
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