igneous
Granite fragment
Granite, chiefly quartz, alkali feldspar, plagioclase, and mica
AI-generated identification · may be incorrectCoarse-grained, speckled gray-white rock with a crystalline texture and low-glass luster; typical hardness is about 6–7 Mohs, with poor cleavage as a whole and density around 2.6–2.8 g/cm³.
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Physical properties
Coarse-grained, speckled gray-white rock with a crystalline texture and low-glass luster; typical hardness is about 6–7 Mohs, with poor cleavage as a whole and density around 2.6–2.8 g/cm³.
Formation & geological history
An intrusive igneous rock formed when silica-rich magma cooled slowly deep underground, producing visible crystals; most granite formed during Precambrian to Phanerozoic mountain-building events.
Uses & applications
Widely used for countertops, monuments, building stone, aggregate, and decorative landscaping; ordinary small fragments have little commercial value.
Geological facts
Quartz grains are usually glassy gray, feldspar grains white or pink, and dark minerals commonly biotite or amphibole. The specimen’s exact identification is limited by its small, weathered appearance.
Field identification & locations
Identify it by visible interlocking crystals, speckled light color, and inability to scratch with a steel knife; it commonly occurs in continental mountain belts and glacial deposits.
