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greisen

American

[grahy-zuhn] / ˈgraɪ zən /

noun

a hydrothermally altered rock of granitic texture composed chiefly of quartz and mica, common in the tin mines of Europe.

greisen British

/ ˈɡraɪzən /

noun

a light-coloured metamorphic rock consisting mainly of quartz, white mica, and topaz formed by the pneumatolysis of granite

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of greisen

Borrowed into English from German around 1875–80

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023