Chalcostibite altering to Azurite and Malachite - image 1

Chalcostibite altering to Azurite and Malachite

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This seemingly humble specimen is actually quite significant as it is a mostly UNALTERED crystal of this species, whereas the common sort from this locality is almost completely altered to azurite and malachite as a mixture. This very stout, well-formed crystal instead is still almost entirely CHALCOSTIBITE, though it has a thin alteration skin on parts of the surface. Old and rare material!