Greisening


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Greisening

 

(geology), a medium-temperature process of the alteration of granites under the action of gases and solutions given off by cooling granitic bodies. In the greisening process, light-colored micas (lepidolite and muscovite) are formed from the granite feldspars. As a result of greisening, the parent rock is turned into greisens.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.