Definitions for "Felsite"
A finegrained rock, flintlike in fracture, consisting essentially of orthoclase feldspar with occasional grains of quartz.
A general term for dense, igneous rock composed of quartz, feldspar, and ferromagnesium minerals which are so fine grained that the composition of the rock is difficult to determine. The group includes rhyolite, dacite, trachyte, and andesite.
a light colored fine-grained igneous rock.