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The most common asbestiform mineral is chrysotile, commonly called "white asbestos", a magnesium phyllosilicate part of the serpentine group. Other asbestiform minerals include riebeckite , an amphibole whose fibrous form is known as crocidolite or "blue asbestos", and brown asbestos , a cummingtonite-grunerite solid solution series.
Three polytypes of chrysotile are known. [8] These are very difficult to distinguish in hand specimens, and polarized light microscopy [6] must normally be used. Some older publications refer to chrysotile as a group of minerals—the three polytypes listed below, and sometimes pecoraite as well—but the 2006 recommendations of the International Mineralogical Association prefer to treat it as ...
Amosite and crocidolite are considered the most hazardous asbestos fiber types; [5] however, chrysotile asbestos has also produced tumors in animals and is a recognized cause of asbestosis and malignant mesothelioma in humans, [6] and mesothelioma has been observed in people who were occupationally exposed to chrysotile, family members of the ...
In contrast, lizardite and chrysotile typically form near the Earth's surface and break down at relatively low temperatures, probably well below 400 °C (800 °F). It has been suggested that chrysotile is never stable relative to either of the other two serpentine polymorphs.
In June 1982, a retired boilermaker, James Cavett, won an award of $2.3 million compensatory and $1.5 million in punitive damages against Johns-Manville. [66] The Manville Corporation, formerly the Johns-Manville Corporation, filed for reorganization and protection under the United States Bankruptcy Code in August 1982. At the time, it was the ...
AIB is 16-35% asbestos, typically a blend of amosite and chrysotile, though crocidolite was also used in early boards. AIB is softer, more porous and less dense than asbestos cement . This, and the fact it typically contains a greater proportion of asbestos than the 10-15% of asbestos cement, [ 2 ] makes AIB far more friable and thus at greater ...
Alkyl sulfonic acids, liquid or Aryl sulfonic acids, liquid with not more than 5 percent free sulfuric acid UN 2587: 6.1: Benzoquinone: UN 2588: 6.1: Pesticides, solid, toxic, not otherwise specified UN 2589: 6.1: Vinyl chloroacetate: UN 2590: 9: White asbestos (chrysotile, actinolite, anthophyllite, tremolite) UN 2591: 2: Xenon, refrigerated ...
Diopside is a precursor of chrysotile (white asbestos) by hydrothermal alteration and magmatic differentiation; [6] it can react with hydrous solutions of magnesium and chlorine to yield chrysotile by heating at 600 °C for three days. [7]