'Greisen' definitions:
Definition of '
greisen
'
From:
WordNet
noun
A granitic rock composed of quartz and mica
Definition of '
Greisen
'
From:
GCIDE
Greisen \Grei"sen\, n. (Min.) A crystalline rock consisting of quarts and mica, common in the tin regions of Cornwall and Saxony. [1913 Webster]
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