igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectPale gray to cream with black mineral flecks and visible interlocking crystals; typically Mohs 6–7, vitreous quartz and feldspar luster, with no regular cleavage as a whole rock. Exact mineral proportions and density cannot be confirmed from the photo.
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Physical properties
Pale gray to cream with black mineral flecks and visible interlocking crystals; typically Mohs 6–7, vitreous quartz and feldspar luster, with no regular cleavage as a whole rock. Exact mineral proportions and density cannot be confirmed from the photo.
Formation & geological history
Forms when silica-rich magma cools slowly underground, allowing large crystals to grow; granite occurs in ancient continental crust of many geological ages.
Uses & applications
Used for building stone, countertops, paving, monuments, and decorative aggregate; small pieces are also collected.
Geological facts
Granite’s contrasting speckles come from different minerals crystallizing together, commonly quartz, feldspars, and biotite or hornblende.
Field identification & locations
The coarse, interlocking grains and light color with dark flecks are typical of granite. It is widespread in continental mountain belts and shields; a hand sample usually has modest value.
