igneous
Weathered granitic rock
Granite or granodiorite; primarily quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pale gray to tan, with visible interlocking quartz and feldspar grains plus dark mica or amphibole. Typically Mohs hardness 6–7, vitreous to dull luster, no cleavage as a rock, and specific gravity about 2.6–2.8.
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Physical properties
Coarse-grained, pale gray to tan, with visible interlocking quartz and feldspar grains plus dark mica or amphibole. Typically Mohs hardness 6–7, vitreous to dull luster, no cleavage as a rock, and specific gravity about 2.6–2.8.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep within the crust, commonly during Precambrian to Mesozoic tectonic episodes; the specimen appears weathered and fractured.
Uses & applications
Used extensively as dimension stone, countertops, paving, aggregate, monuments, and building material; ordinary hand specimens have little commercial or collector value.
Geological facts
The exact identification is limited by the small, weathered photograph; granodiorite and heavily weathered quartz-rich rocks can look similar.
Field identification & locations
Look for coarse interlocking crystals: translucent gray quartz, white or pink feldspar, and scattered black mica/amphibole. Common in continental mountain belts and exposed plutons worldwide; a streak test is generally unhelpful.
