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DickiteDickite is a phyllosilicate clay mineral, with an identical composition as kaolinite, nacrite, and halloysite, but with a different crystal structure (polymorph). Its chemical composition is Al2Si2O5(OH)4. It occurs with other clays and requires x-ray diffraction for its positive identification. Dickite is an important alteration indicator in hydrothermal systems as well as occuring in soils and shales. References
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