igneous
Granite (likely weathered granite fragment)
Coarse crystalline felsic intrusive rock, chiefly quartz, potassium feldspar, plagioclase, and minor biotite or hornblende
AI-generated identification · may be incorrectLight gray to cream with dark speckles and a granular texture; typically Mohs 6–7, vitreous-to-dull luster, interlocking crystals, and no prominent cleavage as a rock. The image is somewhat blurred, so exact identification is provisional.
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Physical properties
Light gray to cream with dark speckles and a granular texture; typically Mohs 6–7, vitreous-to-dull luster, interlocking crystals, and no prominent cleavage as a rock. The image is somewhat blurred, so exact identification is provisional.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep within continental crust, commonly during Precambrian to Phanerozoic mountain-building events. Weathering and erosion later expose and break it into surface fragments.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and architectural cladding; ordinary fragments have negligible jewelry value.
Geological facts
Its visible light and dark grains reflect feldspar/quartz and mafic minerals, producing the classic “salt-and-pepper” appearance. Granite is an intrusive equivalent of volcanic rhyolite.
Field identification & locations
Identify it by coarse interlocking grains, abundant pale feldspar, glassy gray quartz, and scattered dark biotite or hornblende; common worldwide in continental shields and mountain belts. A hand lens and streak, hardness, and acid tests help distinguish it from similar gneiss or diorite.
