igneous
Weathered granite
Granite, chiefly quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectCoarse-grained, mottled pink, gray, white, and black; crystals show interlocking texture and no obvious cleavage as a rock. Hardness is approximately 6–7 Mohs, with a vitreous to dull weathered luster and specific gravity about 2.63–2.75.
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Physical properties
Coarse-grained, mottled pink, gray, white, and black; crystals show interlocking texture and no obvious cleavage as a rock. Hardness is approximately 6–7 Mohs, with a vitreous to dull weathered luster and specific gravity about 2.63–2.75.
Formation & geological history
An intrusive felsic igneous rock formed by slow cooling of silica-rich magma deep in the continental crust, commonly during Precambrian to Phanerozoic plutonic events. Surface weathering has rounded and dulled the specimen.
Uses & applications
Widely used as building stone, countertops, monuments, paving, aggregate, and decorative material; ordinary hand specimens have little commercial value.
Geological facts
Pink areas are typically potassium feldspar, pale grains are quartz or plagioclase, and dark grains are biotite or amphibole. Its coarse texture reflects slow underground cooling.
Field identification & locations
Identify it by visible interlocking crystals, abundant pink/white feldspar, gray translucent quartz, and black mica or amphibole; it is common in continental shields, mountain batholiths, and glacial deposits.
