igneous
Granite fragment
Granite; predominantly quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, speckled gray-brown rock with glassy quartz, pale feldspar, and dark mica; typical hardness 6–7 Mohs, nonmetallic luster, interlocking crystals, and no prominent cleavage as a whole.
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Physical properties
Coarse-grained, speckled gray-brown rock with glassy quartz, pale feldspar, and dark mica; typical hardness 6–7 Mohs, nonmetallic luster, interlocking crystals, and no prominent cleavage as a whole.
Formation & geological history
An intrusive igneous rock formed by slow crystallization of silica-rich magma deep underground, generally during Precambrian to Phanerozoic continental mountain-building events.
Uses & applications
Widely used as dimension stone, countertops, monuments, paving, aggregate, and decorative material; this small fragment has negligible commercial value.
Geological facts
Granite’s visible crystals indicate slow cooling, unlike fine-grained volcanic rocks such as rhyolite. Its exact identification is uncertain from the low-resolution photograph.
Field identification & locations
Identify it by its coarse interlocking grains and mixed quartz-feldspar-mica appearance; common worldwide in continental crust and quarried in India, Brazil, China, Scandinavia, and North America.
