igneous
Weathered granite (probable)
Granite; chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectA coarse-grained, tan-gray intrusive rock with speckled crystalline texture and dull weathered surfaces; typical hardness is about 6–7 Mohs, with no prominent cleavage as a whole and density around 2.6–2.7 g/cm³.
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Physical properties
A coarse-grained, tan-gray intrusive rock with speckled crystalline texture and dull weathered surfaces; typical hardness is about 6–7 Mohs, with no prominent cleavage as a whole and density around 2.6–2.7 g/cm³.
Formation & geological history
Formed when silica-rich magma cooled slowly deep underground, allowing visible crystals to grow; most granite formed during Precambrian to Phanerozoic plutonic events and was later exposed by uplift and erosion.
Uses & applications
Used extensively as dimension stone, countertops, monuments, building stone, and crushed aggregate; ordinary hand specimens have minimal commercial value.
Geological facts
The photograph is somewhat out of focus, so closely related rocks such as weathered granodiorite or quartz monzonite cannot be ruled out.
Field identification & locations
Look for interlocking visible grains: glassy gray quartz, pink/tan feldspar, and black mica or amphibole. Common worldwide in continental mountain belts, including the Sierra Nevada, New England, Scotland, and parts of India and Australia.
