igneous
Weathered granitic rock
Granite, predominantly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pale pink/tan matrix with dark biotite or hornblende flecks; crystalline texture and generally massive structure. Hardness is approximately 6–7 Mohs, with vitreous quartz and feldspar luster; cleavage occurs in feldspar, not as a whole rock.
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Physical properties
Coarse-grained, pale pink/tan matrix with dark biotite or hornblende flecks; crystalline texture and generally massive structure. Hardness is approximately 6–7 Mohs, with vitreous quartz and feldspar luster; cleavage occurs in feldspar, not as a whole rock.
Formation & geological history
Formed by slow cooling of silica-rich magma deep in the crust, producing interlocking crystals; the image may show weathering along a fracture or joint. Granite commonly formed during Precambrian to Phanerozoic plutonic events.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and landscaping material; attractive polished pieces have modest decorative or collector value.
Geological facts
The pink coloration commonly comes from potassium feldspar, while black grains are usually biotite mica or amphibole. Granite often develops prominent joints that later widen through chemical weathering.
Field identification & locations
Identify it by visible interlocking quartz, feldspar, and dark mica grains; it does not fizz readily with dilute hydrochloric acid. Common worldwide in continental mountain belts and exposed shield regions.
