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Chrysocolla is a hydrated copper silicate mineral with formula (Cu,Al)2H2Si2O5(OH)4·nH2O. Chrysocolla has a blue-green color and is a minor ore of copper, having a hardness of 2.5 to 3.5. It is of secondary origin and forms in the oxidation zones of copper ore bodies. Associated minerals are quartz, limonite, azurite, malachite, cuprite, and other secondary copper minerals. It is typically found as botryoidal or rounded masses and crusts, or vein fillings. Because of its light color, it is sometimes confused with turquoise. Notable occurrences include Israel, Democratic Republic of Congo, Chile, Cornwall in England, and Arizona, Utah, New Mexico and Pennsylvania in the United States. (source: Wikipedia) Photo by Michael Marcotte Return to List Back to Michael's Hobbies page Back to Michael Marcotte's HomePage