Cyanotrichite

Cu4Al2SO4(OH)12.2H2O

This sample of cyanotrichite is displayed in the Smithsonian Museum of Natural History. Cyanotrichite is a sulfate mineral of copper with the composition Cu4Al2SO4(OH)12.2H2O. The sample at left is about 10 cm across and is from Banat, Romania.

Mindat: Cyanotrichite

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