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The pure variety of corundum is __________

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The pure variety of corundum is __________

(a) Emerald and ruby

(b) Ruby and Sapphire

(c) Sapphire and diamond

(d) Ruby and Coral

The question was asked in quiz.

This intriguing question comes from Mineral Resources of India in chapter Economic Mineral Deposits of Engineering Geology

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The correct answer is (b) Ruby and Sapphire

The explanation is: A high grade natural abrasive- corundum. The mineral finds use in grinding wheels. Its pure varieties form gems- the ruby and sapphire.

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