granite is it a mineral
Granite is a light-colored igneous rock with grains large enough to be visible with the unaided eye. It forms from the slow crystallization of magma below Earthâs surface. Granite is composed mainly of quartz and feldspar with minor amounts of mica, amphiboles and other minerals.This mineral composition usually gives granite a red, pink, gray or white color with dark mineral grains visible throughout the rock. Granite is the best-known igneous rock.hree common usages of the word granite are explained below. Granite is a coarse-grained, light-colored igneous rock composed mainly of feldspars and quartz with minor amounts of mica and amphibole minerals. This simple definition enables students to easily identify the rock based upon a visual inspection.