felsite

noun — 2 senses

felsite

noun

Chemistry, Geography, Geology, Mineralogy, Natural sciences, Physical sciences A fine grained volcanic extrusive rock, generally light in color, composed of felsic minerals.

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

Geography, Geology, Natural sciences Any light-colored volcanic rock whose true mineralogy is not yet determined.

Synonyms: eurite
Derived terms: felsitic

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.