igneous
Weathered granite-like rock
Coarse-grained granitic rock, likely quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectTan to gray, granular texture with visible interlocking crystals and little luster; likely Mohs hardness 6–7, no cleavage as a whole, and specific gravity about 2.6–2.7. The image is insufficient for precise mineral identification.
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Physical properties
Tan to gray, granular texture with visible interlocking crystals and little luster; likely Mohs hardness 6–7, no cleavage as a whole, and specific gravity about 2.6–2.7. The image is insufficient for precise mineral identification.
Formation & geological history
Formed by slow cooling of silica-rich magma beneath Earth’s crust, commonly during Precambrian to Phanerozoic continental plutonism; surface weathering has rounded and discolored the specimen.
Uses & applications
Used widely as crushed stone, aggregate, building stone, countertops, monuments, and decorative material; this small weathered piece has negligible commercial value.
Geological facts
Granite commonly contains quartz, potassium feldspar, plagioclase, and biotite or muscovite. The brown coloration may reflect iron-oxide weathering of feldspar or mica.
Field identification & locations
Look for hard, interlocking grains: glassy gray quartz, pink/tan feldspar, and dark mica; it should scratch glass and resist steel. Common worldwide in continental mountain belts and exposed batholiths.
