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Sandpaper is a common application of ______ abrasives.

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Sandpaper is a common application of ______ abrasives.

(a) Garnet and flint

(b) Rottenstone and pumica

(c) Walnut shells

(d) Silicon carbide

This question was addressed to me during an online interview.

My question is taken from Abrasives, Silicate Structures and Polymorphism topic in chapter Composite & Ceramic Materials of Engineering Material & Metallurgy

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Correct choice is (a) Garnet and flint

For explanation: Garnet and flint are natural abrasives typically used for sandpaper. Walnut shells find their application for cleaning of aircraft engine parts, whereas rottenstone and pumica are used for wood finishing.

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