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The ferro-magnesium mineral which occurs in ultra-basic igneous rocks is __________

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The ferro-magnesium mineral which occurs in ultra-basic igneous rocks is __________

(a) Magnesite

(b) Olivine

(c) Baryte

(d) Corundum

This question was addressed to me in an online interview.

My question is based upon Formation and Descriptive Study of Minerals in division The Study of Minerals of Engineering Geology

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Correct option is (b) Olivine

To explain I would say: Olivine is a type of ferro-magnesium mineral which is found in the ultra-basic igneous rocks. Magnesite is also found in the ultra-basic igneous rocks but do not belong to the ferro-magnesium group.

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