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(CuCO₃) is not known to exist in nature, due to the high affinity of the ion for the hydroxide anion .

Azurite crystallizes in the monoclinic system. Large crystals are dark blue, often prismatic. Azurite specimens can be massive to nodular or can occur as drusy crystals lining a cavity.

Azurite has a Mohs hardness of 3.5 to 4. The specific gravity

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