igneous
Weathered granitic rock fragment
Granite, predominantly quartz–feldspar–mica assemblage
AI-generated identification · may be incorrectCoarse, speckled gray-white texture with dark mica or amphibole; quartz hardness 7 and feldspar about 6, generally vitreous to dull luster, granular interlocking crystals, no prominent cleavage as a whole. The specimen appears heavily weathered and partly coated with soil.
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Physical properties
Coarse, speckled gray-white texture with dark mica or amphibole; quartz hardness 7 and feldspar about 6, generally vitreous to dull luster, granular interlocking crystals, no prominent cleavage as a whole. The specimen appears heavily weathered and partly coated with soil.
Formation & geological history
Likely intrusive igneous rock crystallized slowly from silica-rich magma deep in Earth’s crust, commonly during Precambrian to Mesozoic continental events; exact age cannot be determined visually.
Uses & applications
Used as aggregate, building stone, paving, monuments, and countertops; this small weathered fragment has negligible commercial or jewelry value.
Geological facts
Granite is a rock rather than a single mineral and commonly contains quartz, alkali feldspar, plagioclase, biotite, and/or hornblende.
Field identification & locations
Identify it by visible interlocking light quartz/feldspar grains and scattered dark minerals; a fresh broken surface is more diagnostic than this soil-covered example. Common worldwide in continental crust and glacial or stream gravels.
