igneous
Weathered granitic rock
Granite or granodiorite; quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectCoarse-grained, speckled gray, pink, and dark brown surface with vitreous to dull luster and irregular fracture. Typical hardness is about 6–7 Mohs; individual grains show no consistent cleavage at specimen scale, and density is commonly 2.6–2.8 g/cm³.
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Physical properties
Coarse-grained, speckled gray, pink, and dark brown surface with vitreous to dull luster and irregular fracture. Typical hardness is about 6–7 Mohs; individual grains show no consistent cleavage at specimen scale, and density is commonly 2.6–2.8 g/cm³.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep in the crust, generally during Precambrian to Phanerozoic mountain-building events; the surface is strongly weathered or stained.
Uses & applications
Used widely as crushed aggregate, building stone, paving, monuments, and countertops; this small weathered piece has little jewelry value.
Geological facts
The visible grains likely include translucent quartz, pale potassium/plagioclase feldspar, and dark biotite or amphibole. Exact identification is limited because the specimen is rounded, weathered, and photographed without a fresh surface.
Field identification & locations
Identify it by coarse interlocking grains, quartz-rich gray coloration, and pink or white feldspar; it will not fizz with dilute hydrochloric acid. Common worldwide in continental crust, especially exposed mountain and shield regions.
