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High density, high refractive index is characteristic of ___________

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High density, high refractive index is characteristic of ___________

(a) Non-metallic minerals

(b) Metallic minerals

(c) Semi-metallic minerals

(d) Metalloid minerals

I got this question during a job interview.

I need to ask this question from Physical Properties in chapter The Study of Minerals of Engineering Geology

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Right answer is (b) Metallic minerals

For explanation: Metallic lustres are characteristics of high density, high refractive index and opaque minerals like galena, pyrite and chalcopyrite.

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