Azurite
Copper Carbonate Hydroxide, Cu3(CO3)2-(OH)2
Crystal System: Monoclinic
Hardness: 3.5-4.0
Density: 3.83

Azurite occurs as a secondary mineral in the oxidized zones of copper deposits. It is associated with malachite, chrysocolla, cuprite, native copper, chalcocite, calcite, and limonite. Azurite forms at a lower temperature than malachite, which it commonly replaces as a pseudomorph. Pseudomorphs of azurite after other minerals are also common. Azurite also occurs in sandstones where carbolic waters mixed with waters rich in copper sulfates.

Azurite occurs as elongated or tabular prismatic crystals exhibiting various shades of transparent to translucent azure blue with a vitreous luster. Crystals are often intergrown or grouped in radiating aggregates and also occur as granular or concretionary masses. Azurite often forms sharp crystals in contrast to malachite.

Rocks from Ron Zeilstra's Collection

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bkeller@rockhounds.com 11/29/95