igneous
Likely quartz-rich rock or weathered granite fragment
Granite-like quartz–feldspar aggregate; exact identification requires testing
AI-generated identification · may be incorrectLight gray, granular, and dull to slightly vitreous, with visible white quartz/feldspar and darker grains; likely Mohs 6–7, massive with no obvious cleavage, and specific gravity about 2.6–2.7.
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Physical properties
Light gray, granular, and dull to slightly vitreous, with visible white quartz/feldspar and darker grains; likely Mohs 6–7, massive with no obvious cleavage, and specific gravity about 2.6–2.7.
Formation & geological history
Probably an ordinary weathered igneous rock formed by slow crystallization of silica-rich magma in the continental crust, commonly hundreds of millions to billions of years old; the image alone cannot establish its age.
Uses & applications
Common granite-like material is used as crushed stone, aggregate, building stone, and occasionally decorative material, but this small fragment has little commercial use.
Geological facts
The bright grains may be quartz, while opaque dark specks could be biotite, iron-oxide staining, or inclusions; surface weathering makes precise identification uncertain.
Field identification & locations
Look for interlocking grains, a glassy quartz response, and hardness sufficient to scratch ordinary glass; dilute acid should not fizz unless calcite is present. Common worldwide in granite terrains and construction fill.
