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Coquimbite, Voltaite

Coquimbite : Fe2-xAlx(SO4)3·9H2O, x ~0.5, Voltaite : K2Fe2+5Fe3+3Al(SO4)12·18H2O
minID: 1R8-7U7

This image has been released to the public domain and may be used freely.

A simply outstanding small cabinet(2 x 2 x 2 inches appx.) specimen of Coquimbite with a large patch of Voltaite crystals. Very rare this fine. Also has Romerite and probable Goldichite on the specimen!

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Photo added: 11th Oct 2009

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