Abstract
The quantitative XRD determination of the most common serpentinite minerals, e.g. lizardite and chrysotile, is hampered by strongly overlapping reflections. Reconnaissance investigations indicated that the reflections 204 of lizardite and 008 of chrysotile are best suited for quantitative XRD. These lines are not interferred by other minerals such as brucite, magnesite, chlorite or talc, which are common in serpentinites. A calibration curve for the determination of the chrysotile/lizardite ratios in natural serpentinites has been constructed by means of synthetically prepared chrysotile/lizardite standards. Using this method serpentinites of the Msauli Chrysotile Asbestos Mine, South Africa, were investigated for their relative chrysotile contents. It was found, that the total amount of chrysotile in the ore zone is considerably higher than the amount of extractable chrysotile asbestos fibre.
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