igneous
Weathered granite
Granite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, mottled white, pink, gray, and brown with a vitreous-to-dull luster; hardness about 6–7 Mohs, no distinct cleavage as a rock, and typical specific gravity 2.63–2.75. The brown surface reflects iron staining and weathering.
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Physical properties
Coarse-grained, mottled white, pink, gray, and brown with a vitreous-to-dull luster; hardness about 6–7 Mohs, no distinct cleavage as a rock, and typical specific gravity 2.63–2.75. The brown surface reflects iron staining and weathering.
Formation & geological history
An intrusive felsic igneous rock formed by slow cooling of silica-rich magma deep in the crust, generally during Precambrian to Phanerozoic continental uplift. Exposure and weathering produced the rough, stained exterior.
Uses & applications
Used extensively as dimension stone, countertops, monuments, paving, aggregate, and architectural cladding; attractive pieces may be polished for decorative use.
Geological facts
Visible interlocking crystals of quartz and feldspar distinguish granite from fine-grained volcanic rocks. Pink coloration commonly comes from potassium feldspar, while dark flecks are biotite or hornblende.
Field identification & locations
Identify it by coarse interlocking grains, pale quartz/feldspar, and scattered dark mica or amphibole; a glassy surface or acid fizz would suggest something else. Granite occurs widely in continental shields and mountain batholiths worldwide.
