Anukruti posted an MCQ
July 22, 2020 • 16:03 pm 30 points
  • IIT JAM
  • Geology (GG)

Which of the following will have highest colour index?

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    Rahul kumar best-answer

    The percentage of mafic minerals is highest in peridotite among all given options

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    Sajan sarthak Best Answer

    1.The colour index of an Igneous rock is a measure of the ratio of dark colored, or mafic, minerals to light coloured, or felsic, minerals. 2.Peridotite is ultarmafic so High colour index. 3.In general, the gradation from felsic to mafic corresponds to an increase in colour index(dark-mineral percentage).

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