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The radiation diffraction pattern for amorphous materials requires special analysis for information on atomic groupings. Powdered crystalline material may also give diffuse patterns requiring this type of analysis. Absence of a sharp diffraction pattern does not necessarily indicate absence of the material. Examples are given for chrysotile and powdered chrysotile.doi:10.1289/ehp.749137 pmid:4470926 pmcid:PMC1475374 fatcat:rhspsi4mbngpflj5qfzsngx374