Multiple choice Which of the following pairs of 'copper mineral : chemical formula' is incorrect? Azurite : Cu2CO3(OH)2 Peacock ore : Cu5FeS4 Chalcopyrite : CuFeS2 Turquoise : CuAl6(PO4)4(OH)8.5H2O Dioptase : CuSiO2(OH)2 Reveal answer Fill a bubble to check yourself A Correct answer Explanation Chemical formula of azurite is Cu3(CO3)2(OH)2. Chemical formula of malachite is Cu2CO3(OH)2.