Definitions

from The Century Dictionary and Cyclopedia

  • In petrography, a term proposed by Brögger (1896) to designate igneous rocks characterized by a preponderance of light-colored minerals, or rather of minerals that are normally light-colored (chiefly feldspar and feldspathic minerals, and quartz), as contrasted with those (melanocratic) in which there is a preponderance of dark-colored minerals.

Etymologies

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Examples

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  • Of a mineral or rock: having a light color.

    January 22, 2008