Chalcophyllite

Cu18Al2((OH)9,SO4, AsO4)3.33H2O

This sample of chalcophyllite is displayed in the Smithsonian Museum of Natural History. Chalcophyllite contains copper and arsenic with the composition Cu18Al2((OH)9,SO4, AsO4)3.33H2O. The sample at left is about 12 cm across.

Mindat: Chalcophyllite

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