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What is a greisen?

What is a greisen? Here are some definitions.

Noun
  1. (geology) A highly altered granitic rock containing quartz and mica.
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Examples
Eventually we reached the site, a few trenches along veins of greisen.
In Pemali, tin deposits exist as a stockwork and greisen in granite and turmaline casiterite veins which run parallel.
At the Redskin mine, molybdenite is found in small cylindrical greisen pipes in the Redskin Granite.
Kelly Gregg, Adam Terry, Nick Greisen and Yamon Fugurs are listed as questionable.
Greisen is closely connected with schorl rock both in its mineralogical composition and in its mode of origin.

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