Multiple choice

Which of the following pairs of 'copper mineral : chemical formula' is incorrect?

  1. Azurite : Cu2CO3(OH)2

  2. Peacock ore : Cu5FeS4

  3. Chalcopyrite : CuFeS2

  4. Turquoise : CuAl6(PO4)4(OH)8.5H2O

  5. Dioptase : CuSiO2(OH)2

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A Correct answer
Explanation

Chemical formula of azurite is Cu3(CO3)2(OH)2. Chemical formula of malachite is Cu2CO3(OH)2.