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The type of mineral showing variable colour is?

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The type of mineral showing variable colour is?

(a) Idiochromatic

(b) Allochromatic

(c) Iridescence

(d) Pseudochromatic

I got this question in an online quiz.

Question is taken from Physical Properties topic in portion The Study of Minerals of Engineering Geology

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Correct answer is (b) Allochromatic

The best I can explain: Allochromatic minerals have a variable colour; the variety in colour is generally due to minute quantities of colouring impurities thoroughly dispersed in the mineral composition.

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