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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.
Origin of greisen
1875-1880
Borrowed into English from German around 1875-80
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for greisen

greisen

/ˈɡraɪzən/
noun
1.
a light-coloured metamorphic rock consisting mainly of quartz, white mica, and topaz formed by the pneumatolysis of granite
Word Origin
C19: from German, from greissen to split
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
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