igneous
Weathered granite (likely)
Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica
AI-generated identification · may be incorrectGray-green, rough and granular with visible light and dark mineral grains; typical granite minerals have Mohs hardness about 6–7, vitreous to dull luster, and no consistent cleavage as a whole rock. The photo is insufficient to confirm its exact mineral composition or crystal structure.
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Physical properties
Gray-green, rough and granular with visible light and dark mineral grains; typical granite minerals have Mohs hardness about 6–7, vitreous to dull luster, and no consistent cleavage as a whole rock. The photo is insufficient to confirm its exact mineral composition or crystal structure.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in the crust; specimens may be hundreds of millions to billions of years old. Weathering and erosion expose and break it into fragments.
Uses & applications
Granite is widely used as dimension stone, paving, countertops, aggregate, and monuments; this small rough fragment is mainly of educational or collecting interest.
Geological facts
The specimen’s mottled texture and apparent interlocking grains are consistent with granite, but similar weathered igneous rocks can look alike in a photograph.
Field identification & locations
Check for interlocking quartz and feldspar grains and scattered dark mica; a fresh surface or hand lens can improve identification. Granite occurs worldwide in continental crust and mountain belts.
