Chrysocolla

Chrysocolla from Nevada, USA Chrysocolla (hydrated copper silicate) is a normal mineral, CuSiO3•nH2O. It is of secondary origin and also forms in the oxidation zones of copper ore bodies. Associated minerals are normally quartz, limonite, azurite, malachite, cuprites, and other secondary copper minerals.

Chrysocolla is an attractive blue-green colour and is minor ore of its copper, having a hardness of 2.6 to 3.5. It is usually also used as an ornamental stone. It is typically found as glassy botryoidally and rounded masses and crusts, or vein fillings.

The name comes from the Greek chrysies, "gold", and kola, "glue", in allusion to the name of the material used to solder gold, and then was first used by Theophrastus in 316 BCE.

Notable occurrences include Israel, Zaire, Chile, and Cornwall in England, and Arizona, Utah, New Mexico and also at Pennsylvania in the United States.