Composition of azurite mineral is:

C u C O_{3} . C u O

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C u (H C O_{3})_{2} . C u (O H)_{2}

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2 C u C O_{3} . C u (O H)_{2}

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None of these

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Solution

The correct option is D $2 C u C O_{3} . C u (O H)_{2}$
Azurite is one of the basic copper (II) carbonate minerals, the other being bright green malachite. Simple copper carbonate (CuCO3) is not known to exist in nature. Azurite has the formula $C u (C O_{3})_{2} (O H)_{2}$ with the copper (II) cations linked to two different anions, carbonate and hydroxide.
Hence the composition of azurite mineral is $2 C u C O_{3} . C u (O H)_{2}$

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