Greisen
[grahy-zuh n] /ˈgraɪ zən/
noun
1.
a hydrothermally altered rock of granitic texture composed chiefly of quartz and mica, common in the tin mines of Europe.
/ˈɡraɪzən/
noun
1.
a light-coloured metamorphic rock consisting mainly of quartz, white mica, and topaz formed by the pneumatolysis of granite
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