leucocratic

leuco- +‎ -cratic

leucocratic (comparative more leucocratic, superlative most leucocratic)

1. (geology, of igneous rock) Light in colour, containing at least 90% felsic minerals.
   • 2013, H.G.F. Winkler, Petrogenesis of Metamorphic Rocks, page 325:

     Occasionally the opinion is advanced that the formation of the leucocratic, granitic-granodioritic portions of the heterogeneous in-situ migmatites is due to a metasomatic process, i.e., to the addition of “emanations” from depth.

• melanocratic

• cocirculate