Anukruti Asked a Question
November 25, 2020 11:14 pmpts 30 pts
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  • Rahul kumar thankyou
    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 wat...
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