greisen

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grei·sen

 (grī′zən)
n.
A granitic rock composed chiefly of quartz and mica.

[German, from greissen, to split.]

greisen

(ˈɡraɪzən)
n
(Geological Science) a light-coloured metamorphic rock consisting mainly of quartz, white mica, and topaz formed by the pneumatolysis of granite
[C19: from German, from greissen to split]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.greisen - a granitic rock composed of quartz and mica
rock, stone - material consisting of the aggregate of minerals like those making up the Earth's crust; "that mountain is solid rock"; "stone is abundant in New England and there are many quarries"