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What is the form or structure of corundum?

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What is the form or structure of corundum?

(a) Tabular, flaky

(b) Schistose, columnar

(c) Hexagonal, columnar

(d) Globular, tabular

I had been asked this question in semester exam.

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

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Right option is (c) Hexagonal, columnar

Explanation: The corundum is always found in the hexagonal, columnar crystals. The columnar crystals are of appreciable size of about 8 to 10 mm and are not uncommon.

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