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An unknown chlorite mineral sample can be classified, from an infrared study alone. By relating the infrared absorption spectra to the chemical analysis of a series of 21 chlorites and related minerals, both the degree of substitution of aluminum for silicon (Y number) and the total iron content of the mineral can be estimated from infrared data. The structural type also can be deduced readily from the infrared curve. There is a possibility of a structural modification as Y values increase beyond 1.2. Chlorites are frequently found in areas

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