Azurite - MSN Encarta

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Azurite - Wikipedia, the free encyclopedia
Azurite is a soft, deep blue copper mineral produced by weathering of copper ore deposits. It is also known as Chessylite after the Chessy-les-Mines near Lyon, France, where ...
Azurite
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Azurite Mineral Data
General Azurite Information: Chemical Formula: Cu3(CO3)2(OH)2 : Composition: Molecular Weight = 344.67 gm Copper 55.31 % Cu 69.24 % CuO

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Azurite, blue mineral with the formula Cu₃(OH)₂(CO₃)₂. It is often associated with the green mineral malachite, Cu₂(OH)₂CO₃. Both are basic carbonates of copper and are formed by the alteration of copper sulphide minerals. The most important deposits of azurite and malachite occur at Chessy, near Lyon, in France; in the Ural Mountains of Russia; in Australia; and in Arizona in the United States. Their hardness is 3.5 to 4; azurite's specific gravity is 3.8, malachite's is 4.0.

Azurite and malachite have been used as pigments; when ground, azurite yields blue verditer, and malachite, green verditer. Both minerals have a fine vitreous luster, and when properly polished they are highly ornamental. Since ancient times they have been used widely as gemstones.