Melanocratic Rocks

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 It might be outdated or ideologically biased.

Melanocratic Rocks

 

igneous rocks in which the quantity of dark-colored minerals (those rich in iron and magnesium; for example, pyroxene, amphibole, and biotite) is greater than in the normal average type of the given rock. Melanocratic rocks are contrasted with leucocratic rocks, which are poor in dark-colored minerals.

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