Azurite is an azure-blue copper mineral, occasionally found as prismatic crystals (rarely faceted), but more usually in massive form intergrown with malachite.
Found specifically in copper-mining areas for example Australia, Chile, Russia, Africa, and China. Stones from Chessy, near Lyons in France are known as chessylite.
Copper
Copper Carbonate (unstable state) – Cu3(CO3)2(OH)2
The unstable state alters to malachite and is generally found in combination as azumalachite.
Monoclinic System / Prismatic crystals, botryoidal, stalagmatic, massive, banded.
Cabochons, beads, carvings.
Surface texture
Anisotropic, D.R.; Biaxial positive
1.730 – 1.840 / 0.110
Azurmalachite (structure), Lapis Lazuli (structure, R.I., S.G.), Chrysocolla (structure, R.I., S.G.)
U.S.A. (Arizona), Namibia, France, Romania, Australia, Siberia.
Attacked by hydrochloric acid, light blue streak.
Not characteristic
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