igneous
Weathered granitic rock
Granite or granodiorite; mainly quartz, feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse crystalline, speckled gray-green and cream with dark minerals; vitreous quartz and feldspar luster, Mohs hardness about 6–7, poor or indistinct cleavage as a whole, and specific gravity roughly 2.6–2.8.
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Physical properties
Coarse crystalline, speckled gray-green and cream with dark minerals; vitreous quartz and feldspar luster, Mohs hardness about 6–7, poor or indistinct cleavage as a whole, and specific gravity roughly 2.6–2.8.
Formation & geological history
A plutonic igneous rock crystallized slowly from magma deep within the crust, typically during ancient continental mountain-building; its exact age and subtype cannot be determined from the photograph.
Uses & applications
Commonly used as crushed stone, aggregate, building stone, countertops, monuments, and landscape material; this small weathered piece has minimal commercial value.
Geological facts
The rounded surface and muted colors indicate weathering, while the visible interlocking grains distinguish it from glass or most sedimentary rocks.
Field identification & locations
Likely found in exposed continental plutons, mountain outcrops, glacial deposits, or stream gravels. Confirm by looking for interlocking quartz, feldspar, and dark mica; a glassy quartz grain should scratch glass, while feldspar generally does not.
