igneous
Weathered granite or granitic rock fragment
Granite; chiefly quartz, feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse-grained, gray to tan, with a dull to slightly sparkly luster and irregular fracture; typical hardness is about 6–7 Mohs and specific gravity 2.6–2.8. The image is insufficient to confirm exact minerals or distinguish granite from closely related granodiorite.
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Physical properties
Coarse-grained, gray to tan, with a dull to slightly sparkly luster and irregular fracture; typical hardness is about 6–7 Mohs and specific gravity 2.6–2.8. The image is insufficient to confirm exact minerals or distinguish granite from closely related granodiorite.
Formation & geological history
A plutonic igneous rock that crystallized slowly from magma deep in Earth’s crust, commonly during Precambrian to Phanerozoic mountain-building events. Surface weathering and erosion produced this fragment.
Uses & applications
Widely used as crushed stone, aggregate, building stone, countertops, monuments, and paving; this small weathered piece has negligible commercial value.
Geological facts
Visible light grains likely represent feldspar or quartz, while darker flakes may be biotite or amphibole. A fresh broken surface and hand lens would improve identification.
Field identification & locations
Common worldwide in continental crust and exposed in mountain ranges, shields, and quarry areas. Identify by interlocking visible grains and a mix of light quartz/feldspar with dark mica or amphibole; no acid reaction is expected.
