igneous
Granite fragment
Granite, chiefly quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectHardness about 6–7 Mohs; coarse-grained, pale gray to whitish, with a dull to slightly vitreous luster. The blocky texture and visible light minerals suggest interlocking quartz and feldspar, though the image is not diagnostic enough to confirm exact composition.
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Physical properties
Hardness about 6–7 Mohs; coarse-grained, pale gray to whitish, with a dull to slightly vitreous luster. The blocky texture and visible light minerals suggest interlocking quartz and feldspar, though the image is not diagnostic enough to confirm exact composition.
Formation & geological history
An intrusive igneous rock that crystallized slowly from silica-rich magma deep underground, commonly during Precambrian to Phanerozoic mountain-building events. Uplift and erosion later exposed it at the surface.
Uses & applications
Widely used for building stone, monuments, countertops, paving, aggregate, and landscaping; this small rough fragment has mainly educational or minor collector value.
Geological facts
Granite’s visible crystals formed because underground magma cooled slowly. Pink or white feldspar, gray quartz, and dark biotite or hornblende are typical components.
Field identification & locations
Identify it by its coarse interlocking grains, lack of layering or foliation, and resistance to scratching; quartz will not scratch easily with a steel blade. Common worldwide, especially in continental shields and mountain ranges.
