igneous
Granite fragment
Granite, chiefly quartz–feldspar–mica
AI-generated identification · may be incorrectCoarse-grained, speckled gray-white rock with glassy gray quartz, pale feldspar, and dark mica; typically Mohs 6–7, vitreous to pearly luster, no consistent cleavage as a whole, and specific gravity about 2.63–2.75.
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Physical properties
Coarse-grained, speckled gray-white rock with glassy gray quartz, pale feldspar, and dark mica; typically Mohs 6–7, vitreous to pearly luster, no consistent cleavage as a whole, and specific gravity about 2.63–2.75.
Formation & geological history
Intrusive igneous rock crystallized slowly from silica-rich magma deep in continental crust, commonly during Precambrian to Phanerozoic mountain-building events.
Uses & applications
Widely used as building stone, countertops, monuments, paving, aggregate, and landscaping material; small natural fragments generally have little commercial value.
Geological facts
Individual grains are interlocking crystals, allowing granite to resist weathering and abrasion. The photograph is somewhat blurred, so exact identification is provisional.
Field identification & locations
Identify it by its coarse visible grains, quartz’s glassy gray appearance, light feldspar, and scattered dark mica; common worldwide, especially in continental shields and batholiths.
