igneous
Weathered granite or granitic rock
Coarse-grained granitic rock, likely granite or granodiorite; identification is provisional from the photograph
AI-generated identification · may be incorrectVisible interlocking pale gray/white grains with brown-red iron-oxide staining and possible dark biotite or amphibole; typical Mohs hardness is 6–7, vitreous to dull luster, massive texture, and no obvious cleavage. Quartz and feldspar crystals are likely present.
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Physical properties
Visible interlocking pale gray/white grains with brown-red iron-oxide staining and possible dark biotite or amphibole; typical Mohs hardness is 6–7, vitreous to dull luster, massive texture, and no obvious cleavage. Quartz and feldspar crystals are likely present.
Formation & geological history
Formed by slow cooling of silica-rich magma deep within the continental crust, generally during Precambrian to Phanerozoic plutonic events; surface brown coloration reflects weathering and oxidation.
Uses & applications
Used as crushed stone, aggregate, building stone, countertops, monuments, and landscaping material; ordinary hand specimens commonly sell for about $5–$20.
Geological facts
Granite is an intrusive igneous rock whose large crystals indicate slow underground cooling. The specimen’s irregular shape and staining suggest natural weathering rather than a polished or cut piece.
Field identification & locations
Look for interlocking quartz, feldspar, and dark mica grains rather than layers or vesicles; a glassy quartz grain scratches glass, while feldspar commonly shows cleavage. Common worldwide in continental shields, mountain batholiths, and granite quarries.
