igneous
Granite
Coarse-grained felsic intrusive igneous rock, chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectTypically Mohs 6–7; pinkish-white to gray, with black mica or amphibole, granular texture, and vitreous quartz luster. Crystals are interlocking and visible; cleavage occurs in feldspar, while quartz has none.
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Physical properties
Typically Mohs 6–7; pinkish-white to gray, with black mica or amphibole, granular texture, and vitreous quartz luster. Crystals are interlocking and visible; cleavage occurs in feldspar, while quartz has none.
Formation & geological history
Forms when silica-rich magma cools slowly deep within continental crust, producing large crystals; individual samples may range from Precambrian to younger Phanerozoic ages. Common in batholiths, plutons, and continental mountain belts.
Uses & applications
Widely used as dimension stone, countertops, monuments, flooring, aggregate, and building material; attractive polished pieces are collected but are generally low value.
Geological facts
The pink color commonly comes from potassium feldspar, gray or clear grains from quartz and plagioclase, and black grains from biotite or hornblende. The specimen’s coarse, speckled texture strongly supports granite, though granodiorite is a possible close alternative.
Field identification & locations
Identify it by its visible interlocking crystals and lack of layering or foliation; it should not fizz with dilute hydrochloric acid. Common worldwide, especially in India, Brazil, Scandinavia, Canada, and the United States.
