Two specifications are given for an α-quartz reference material suitable for use by the international occupational hygiene community in the quantitation of α-quartz in respirable dust by the X-ray diffraction method. The specifications are based on results obtained in a detailed investigation of the properties of respirable-size α-quartz samples from 12 different geological and commercial sources. The properties investigated were amorphous surface content, crystallinity index, preferred orientation, and particle size distribution.
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Altree-Williams et al. (1981) studied this question.