Definitions
from The Century Dictionary.
- 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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Two surface grab samples were collected from a newly identified coarse-grained, leucocratic granite outcrop in the Dome North area.
mollusque commented on the word leucocratic
Of a mineral or rock: having a light color.
January 22, 2008