igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectPink, white, and gray mottling with visible interlocking grains; quartz has Mohs hardness 7, feldspars about 6, and mica about 2–3. Typically vitreous quartz and pearly or dull feldspar, with no regular cleavage across the whole rock.
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Physical properties
Pink, white, and gray mottling with visible interlocking grains; quartz has Mohs hardness 7, feldspars about 6, and mica about 2–3. Typically vitreous quartz and pearly or dull feldspar, with no regular cleavage across the whole rock.
Formation & geological history
Magma cooled slowly beneath Earth’s surface, allowing crystals to grow; granite forms across many geological ages in continental crust.
Uses & applications
Used for building stone, countertops, monuments, paving, and decorative stone; attractive pieces may be collected.
Geological facts
Its pale color and visible quartz and feldspar are typical of silica-rich continental crust.
Field identification & locations
Common in continental mountain belts and exposed ancient shield regions; identify by interlocking light-colored grains with scattered dark minerals. The photograph is somewhat blurred, so identification is based on its apparent coarse, mottled texture.
