igneous
Weathered granite or granitic metamorphic rock
Felsic granitoid, primarily quartz, feldspar, and mica; exact identification is uncertain from the photograph
AI-generated identification · may be incorrectGray-brown, fine- to medium-grained, dull to weakly granular luster, with no obvious cleavage; typical hardness is about 6–7 Mohs and specific gravity about 2.6–2.7.
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Physical properties
Gray-brown, fine- to medium-grained, dull to weakly granular luster, with no obvious cleavage; typical hardness is about 6–7 Mohs and specific gravity about 2.6–2.7.
Formation & geological history
Likely crystallized slowly from silica-rich magma deep in the crust, generally Precambrian to Mesozoic in age, then exposed and chemically weathered at the surface.
Uses & applications
Common granite is used as crushed aggregate, building stone, paving, monuments, and countertops; this small weathered fragment has little commercial value.
Geological facts
The brown coloration likely reflects iron-oxide weathering of biotite or other iron-bearing minerals. The image is not detailed enough to distinguish granite confidently from weathered gneiss, quartzite, or another silicate-rich rock.
Field identification & locations
Look for visible interlocking quartz and feldspar grains, occasional black mica, and a hard surface that resists scratching by a steel knife. Common worldwide, especially in continental crust and glacial deposits.
