azurite

Azurite.
Image source: Mineralogical Information Institute

A basic copper carbonate mineral found in the oxidized parts of copper ore veins, often as earthy material with malachite. The crystals are blue, brilliant, and transparent. In the past the gemstones were used as pigments in wall paintings. Hardness 3.5–4, specific gravity 3.77–3.89.

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• GEOLOGY AND PLANETARY SCIENCE

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