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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 ...
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 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]
The Koegas mine was a crocidolite (blue asbestos) mine in Northern Cape, South Africa.It lies near to the town of Prieska and drew much of its workforce from there and Griquatown; though significant proportions also came from Botswana, Zimbabwe and Malawi.
Blue asbestos is possibly 100 times more hazardous than white asbestos, as the fibres are much smaller (around 2.5 to 10 micrometres). [2] The inhalation of asbestos results in illness and in most cases death, due to asbestosis, mesothelioma (of which asbestos is the only known cause) and other lung diseases. [1]
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 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.
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