Which of the following does not contain Mg?

Magnetite

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Magnesite

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Asbestos

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Carnallite

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Solution

The correct option is A Magnetite
Magnetite is a rock mineral and one of the main iron ores, with the chemical formula $F e_{3} O_{4}$ . It does not contain $M g$ .

Magnesite is a magnesium carbonate mineral with a chemical composition of $M g C O_{3}$ .

Asbestos is $C a M g_{3} (S i O_{3})_{4}$ .

Carnallite is an evaporite mineral, a hydrated potassium magnesium chloride with formula $K M g C l_{3} \cdot 6 (H_{2} O)$ .

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