Niedermayrite

Niedermayrite is a rare hydrated copper cadmium sulfate hydroxide mineral with formula: Cu4Cd(SO4)2(OH)6ยท4H2O. It crystallizes in the monoclinic system and occurs as encrustations and well formed vitreous blue-green prismatic crystals. It has a specific gravity of 3.36. Niedermayrite was named for Gerhard Niedermayr (born 1941), an Austrian miner...
Found on http://en.wikipedia.org/wiki/Niedermayrite
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