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Which one is malachite from the following?

1. CuFeS2
2. Cu(OH)2
3. Fe3O4
4. CuCO3·Cu(OH)2

Correct answer: CuCO3·Cu(OH)2

Solution

Malachite is a basic copper carbonate with the chemical formula CuCO3·Cu(OH)2, which is a well-known green mineral.

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