Anukruti posted an Question
November 25, 2020 • 23:14 pm 30 points
  • IIT JAM
  • Geology (GG)

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    Rahul kumar best-answer

    Answer (C) Griesen Greisen, commonly, are granitoid rocks in which > 90% of the feldspar is repleaced by quatz, mica, topaz, tourmaline, cassiterite and other minerals.

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    Sajan sarthak Best Answer

    A process of hydrothermal alteration in which feldspar and muscovite are converted to an aggregate of quartz, topaz, tourmaline, and lepidolite (i.e., greisen) by the action of water vapor containing fluorine. Greisenisation is the process

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