|Category||Crystals and geodes|
|Group||Crystals on ganges|
|Country||Congo - kinshasa|
|Formula (Cu2-xAlx)H2-xSi2O5(OH)4Â·nH2O] CHRYSOCOLLA|
|O||Oxygen||Other no metal||45.06%|
|H||Hydrogen||Other no metal||1.91%|
The chrysocolla has been known since antiquity. It is often associated with other copper-based stones such as azurite, cuprite, malachite. The chrysocolla is found in abundance in copper mines, and a little less in gold mines. It is a hydrated copper silicate: its colors form a marbling ranging from blue to green. It has been used in jewelry since Antiquity, some pieces can weigh several kilos. Chrysocolla is sometimes used as a source of copper.