igneous
Gray granular rock, likely granite or granodiorite
Granite–granodiorite type; mainly quartz, feldspar, and dark mica/amphibole
AI-generated identification · may be incorrectMedium-grained, gray, dull to slightly vitreous; interlocking crystals with no visible foliation or cleavage. Typical hardness is about 6–7 Mohs and specific gravity roughly 2.63–2.75.
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Physical properties
Medium-grained, gray, dull to slightly vitreous; interlocking crystals with no visible foliation or cleavage. Typical hardness is about 6–7 Mohs and specific gravity roughly 2.63–2.75.
Formation & geological history
An intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, generally during Precambrian to Phanerozoic mountain-building events; exact age cannot be determined from the photograph.
Uses & applications
Used as crushed aggregate, road stone, building stone, monuments, countertops, and occasionally as a teaching or collecting specimen.
Geological facts
The pale grains are likely feldspar and quartz, while darker grains may be biotite or hornblende. The image is insufficient to distinguish granite from granodiorite confidently.
Field identification & locations
Look for visible interlocking quartz and feldspar crystals, granular texture, and absence of layering or vesicles; a streak, hardness, and close-up mineral inspection would help. Common worldwide in continental plutons and exposed mountain ranges.
