igneous
Weathered granite fragment
Granite; quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectCoarse-grained, pinkish-brown and gray, with a granular texture and dull to slightly vitreous luster. Typically Mohs 6–7; quartz and feldspar show no consistent cleavage as a whole, while feldspar has two cleavage directions.
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Physical properties
Coarse-grained, pinkish-brown and gray, with a granular texture and dull to slightly vitreous luster. Typically Mohs 6–7; quartz and feldspar show no consistent cleavage as a whole, while feldspar has two cleavage directions.
Formation & geological history
Intrusive igneous rock formed by slow crystallization of silica-rich magma deep in Earth’s crust, commonly during Precambrian to Phanerozoic mountain-building events. The brown surface coloration likely results from weathering and iron staining.
Uses & applications
Used extensively as building stone, paving, monuments, countertops, aggregate, and decorative material; this small weathered fragment has little commercial value.
Geological facts
Granite commonly contains interlocking quartz, potassium feldspar, plagioclase, and minor biotite or amphibole. Its visible grain size reflects slow underground cooling rather than volcanic eruption.
Field identification & locations
Identify it by interlocking visible grains, pale quartz, pink or white feldspar, and dark mica; it is harder than a steel nail and does not fizz with dilute hydrochloric acid. Common worldwide in continental shields and mountain belts.
