felsite

About 0.03 uses per million words.

Meaning

1. noun A fine grained volcanic extrusive rock, generally light in color, composed of felsic minerals.

   The buff-colored dacites of the Superstition Mountains are felsites.

2. noun Any light-colored volcanic rock whose true mineralogy is not yet determined.

Similar words

porphyry quartz porphyritic dykes porphyries felstone felsic felspathoid phonolite fenite

Often followed by

porphyry and is or lavas of porphyries dykes with

Word family

felsites felsitic