igneous
Weathered granite or granitic rock fragment
Granite; quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectLight gray, coarse-grained and granular with a dull weathered surface; likely Mohs hardness 6–7, nonmetallic luster, no obvious cleavage as a whole rock, and specific gravity about 2.6–2.7. Individual feldspar grains may show cleavage, while quartz is glassy and fracture-based.
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Physical properties
Light gray, coarse-grained and granular with a dull weathered surface; likely Mohs hardness 6–7, nonmetallic luster, no obvious cleavage as a whole rock, and specific gravity about 2.6–2.7. Individual feldspar grains may show cleavage, while quartz is glassy and fracture-based.
Formation & geological history
Likely intrusive igneous rock formed when silica-rich magma cooled slowly underground, producing visible interlocking crystals; commonly Precambrian to Mesozoic depending on locality. The rounded, rough surface reflects weathering and abrasion.
Uses & applications
Used extensively as building stone, aggregate, monuments, countertops, and landscaping material; ordinary fragments have negligible commercial value.
Geological facts
Granite commonly contains pink or white feldspar, gray translucent quartz, and black mica or amphibole. The image is too dim and low-resolution for a precise species-level identification.
Field identification & locations
Look for interlocking visible grains of quartz, feldspar, and dark mica, unlike uniform basalt or layered sedimentary rocks; common worldwide in continental mountain belts and exposed plutons. Value is typically $1–$10 for an ordinary specimen, or $10–$30 if labeled and attractive.
