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__________ is a metamorphic rock with compressive strength varies from 1.8 to 3.1 Newton per mm square.

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__________ is a metamorphic rock with compressive strength varies from 1.8 to 3.1 Newton per mm square.

(a) Gneiss

(b) Chalk

(c) Murum

(d) Laterite

This question was posed to me during an interview.

Question is from Common Building Stones of India topic in section Stone and Brick Masonry of Construction & Building Materials

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Correct answer is (d) Laterite

The explanation is: Laterite posses porous and spongy structure which can be easily quarried in blocks and contains high percentage of oxide of iron and also available in different colours. It is mostly used as building stone, Road metal, rough stone masonry work, etc.

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