igneous
Weathered granite
Granite; chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, speckled orange-pink, gray, and black; vitreous quartz and feldspar luster, no obvious cleavage as a whole, Mohs hardness about 6–7, specific gravity roughly 2.6–2.7. The rounded surface indicates weathering or abrasion.
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Physical properties
Coarse-grained, speckled orange-pink, gray, and black; vitreous quartz and feldspar luster, no obvious cleavage as a whole, Mohs hardness about 6–7, specific gravity roughly 2.6–2.7. The rounded surface indicates weathering or abrasion.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep underground, commonly during Precambrian to younger mountain-building events; uplift and erosion later exposed it.
Uses & applications
Widely used for building stone, countertops, monuments, paving, aggregate, and landscaping; ordinary hand specimens have little commercial value.
Geological facts
Its pink-orange color commonly reflects potassium feldspar, while dark flecks are biotite or amphibole. The specimen may also be a closely related granodiorite, which cannot be distinguished confidently from this blurred image.
Field identification & locations
Identify it by visible interlocking crystals: pink/white feldspar, translucent gray quartz, and black mica or amphibole; it will not fizz with dilute hydrochloric acid. Common worldwide, especially in continental shields and mountain belts.
