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Which of the following is not a natural abrasive?

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Which of the following is not a natural abrasive?

(a) Emery

(b) Quartz

(c) Silicon carbide

(d) Sandstone

I got this question by my college professor while I was bunking the class.

Question is from Abrasives, Silicate Structures and Polymorphism topic in section Composite & Ceramic Materials of Engineering Material & Metallurgy

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The correct choice is (c) Silicon carbide

For explanation: An abrasive is a common ceramic material which is hard and mechanically resistant. Synthetic abrasives are preferred as they can be made as per the desired properties and also exhibit more uniformity. Diamond, sandstone, quartz, and emery are a few examples of natural abrasives. Silicon carbide and aluminum oxide are examples of synthetic abrasives.

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