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Asbestos (/ æ s ˈ b ɛ s t ə s, æ z-,-t ɒ s / ass-BES-təs, az-, -toss) [1] is a group of naturally occurring, toxic, carcinogenic and fibrous silicate minerals.There are six types, all of which are composed of long and thin fibrous crystals, each fibre (particulate with length substantially greater than width) [2] being composed of many microscopic "fibrils" that can be released into ...
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 ...
The mountains were named after the asbestos which was mined in the 20th century and is found as a variety of amphibole called crocidolite. Veins occur in slaty rocks, and are associated with jasper and quartzite rich in magnetite and brown iron-ore. Geologically it belongs to the Griquatown series. [citation needed]
The streets of Prieska were paved with asphalt containing asbestos and many buildings in the town were constructed with asbestos cement walls or roofs. [1] [12] Children would play in asbestos waste from the mine tailings, as it could be formed into a malleable clay-like material, and were also exposed by accompanying their mothers to work.
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 ...
Handlers of asbestos materials must have a B-Class license for bonded asbestos and an A-Class license for friable asbestos. The town of Wittenoom, in Western Australia was built around a blue asbestos mine. The entire town continues to be contaminated, and has been disincorporated, allowing local authorities to remove references to Wittenoom ...
The fibrous forms of riebeckite are known as crocidolite and are one of the six recognised types of asbestos. Often referred to as blue asbestos, it is considered the most hazardous. The association between blue asbestos and mesothelioma was established by J. C. Wagner, C. A. Sleggs, and P. Marchand by 1960. [7]