greisen

grei·sen

G0264800 (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]

Thesaurus

Noun

greisen - a granitic rock composed of quartz and micarock, 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"

Greisen

greisen

[′grīz·ən] (petrology) A pneumatolytically altered granite consisting of mainly quartz and a light-green mica.

Greisen

a rock of metasomatic origin, composed basically of quartz and light-colored micas—lepidolite and muscovite. It not infrequently contains an impregnation of valuable ore minerals (such as cassiterite. wolframite, and tantalite) in industrial quantities. In such cases they are regarded as ore bodies. Deposits usually occur in the form of irregularly shaped sections in granite masses, mainly in their outer sections and sometimes in the rocks surrounding the granite Greisen is formed as a result of the greisening of rocks, often along the periphery of ore veins, and serves as an indication for prospecting.

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greisen

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Words related to greisen

noun a granitic rock composed of quartz and mica

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