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The phenomenon due to which a mineral shows rainbow colours is?

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The phenomenon due to which a mineral shows rainbow colours is?

(a) Idiochromatism

(b) Allochromatism

(c) Iridescence

(d) Pseudochromatism

The question was asked in exam.

Question is from Physical Properties in division The Study of Minerals of Engineering Geology

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Right answer is (c) Iridescence

Best explanation: Some minerals may show rainbow colours either in their interior or on the exterior surface. This is called iridescence.

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