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Which mineral is used as refractory material?

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Which mineral is used as refractory material?

(a) Calcite

(b) Rock crystal

(c) Talc

(d) Magnesite

The question was posed to me in an international level competition.

The question is from Formation and Descriptive Study of Minerals topic in section The Study of Minerals of Engineering Geology

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Correct option is (d) Magnesite

Explanation: The major uses of magnesite mineral is that it used as refractory materials in the refracrtory bricks installed in the lining of the furnaces and also used for chemical compounds of magnesium.

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