Gray-blue to green, highly fibrous (asbestiform) form of the amphibole mineral riebeckite. It has higher tensile strength than chrysotile asbestos. The major commercial source is South Africa, where it occurs in Precambrian banded-iron formations; it is also found in Australia and Bolivia.
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The asbestos fibre count at the mine and other facilities was regularly measured at 1000 parts per cm3 this is in stark contrast to the health department guidelines of the 1950s that required less than 176 parts per cm3. By 1967 the 'safe' level of asbestos was limited to 5 parts per cm3.
The company was purchased from CSR Limited by James Hardie industries and has now moved to the Netherlands in an apparent attempt to divorce itself from the asbestos crisis. Presently, the subject of worker's compensation for previous workers, wives and offspring of residents of Wittenoom, it continues to be a big issue for the James Hardie company, who have not moved any further on the compensation case. The present number of known victims is around 2000. Since 1995 a disturbing trend has surfaced, many new cases of wives and children of workers from Wittenoom have been diagnosed with mesothelioma, possibly from washing dust-laden clothes of mine workers, while the children who used to play in the mine tailings that were spread over the streets at Wittenoom, have also been affected.
The subject of the disregard for asbestos miners health and lack of compensation was referenced in the song Blue Sky Mine on the album Blue Sky Mining by Midnight Oil.