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Rock crystal belongs to which mineral group?

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Rock crystal belongs to which mineral group?

(a) Quartz group

(b) Feldspar group

(c) Carbonate group

(d) Ferro-magnesium group

I got this question in a job interview.

This interesting question is from Formation and Descriptive Study of Minerals topic in portion The Study of Minerals of Engineering Geology

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Correct answer is (a) Quartz group

To elaborate: The basic chemical composition of the rock crystal is almost the same as other quartz minerals and also rock crystal is an important mineral of the quartz group.

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