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Which carbonate mineral has this chemical composition- CaCO3 Mg(CO3)2?

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Which carbonate mineral has this chemical composition- CaCO3 Mg(CO3)2?

(a) Magnesite

(b) Calcite

(c) Dolomite

(d) Jasper

I had been asked this question in homework.

I'd like to ask this question from Formation and Descriptive Study of Minerals topic in division The Study of Minerals of Engineering Geology

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Correct choice is (c) Dolomite

To explain I would say: Dolomite has the chemical composition CaCO3 Mg(CO3)2. Whereas calcite doesn’t have Mg in its composition and magnesite lacks Ca in its composition.

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