igneous
Weathered gray granitic rock
Likely granite or granodiorite; quartz, feldspar, and mica-rich silicate rock
AI-generated identification · may be incorrectCoarse crystalline texture, gray color, dull to slightly sparkly luster, and irregular fracture; typical hardness about 6–7 Mohs and specific gravity 2.6–2.8. The image suggests strong surface weathering, so exact identification is uncertain without a closer view.
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Physical properties
Coarse crystalline texture, gray color, dull to slightly sparkly luster, and irregular fracture; typical hardness about 6–7 Mohs and specific gravity 2.6–2.8. The image suggests strong surface weathering, so exact identification is uncertain without a closer view.
Formation & geological history
An intrusive igneous rock that crystallized slowly from magma deep underground, commonly during Precambrian to Phanerozoic continental crust formation. Weathering and erosion later exposed and rounded the specimen.
Uses & applications
Used as dimension stone, paving, monuments, countertops, aggregate, and landscaping rock; this ordinary weathered piece has little jewelry or collector value.
Geological facts
Granite’s visible crystals formed because underground magma cooled slowly. Gray varieties commonly contain abundant quartz and plagioclase feldspar with darker biotite or hornblende.
Field identification & locations
Look for interlocking visible crystals: glassy gray quartz, white or pink feldspar, and black mica/hornblende; a streak test is usually white, and dilute acid should not noticeably fizz. Common worldwide, especially in continental mountain belts.
