igneous
Quartz-rich granitic fragment
Granite or granitic pegmatite; chiefly quartz (SiO₂), feldspar, and minor mica
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pale gray-white, granular texture, vitreous quartz luster, and no obvious cleavage in quartz but cleavage in feldspar. The small, rough, rounded fragment appears crystalline and sparkly.
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Physical properties
Hardness about 6–7 Mohs; pale gray-white, granular texture, vitreous quartz luster, and no obvious cleavage in quartz but cleavage in feldspar. The small, rough, rounded fragment appears crystalline and sparkly.
Formation & geological history
Likely crystallized slowly from silica-rich magma, generally in continental crust; individual granite bodies range from Precambrian to recent geologic ages. Exact identification and age require a fresh surface or testing.
Uses & applications
Common granite is used for construction aggregate, dimension stone, countertops, and monuments; small pieces have modest collecting value.
Geological facts
The visible sparkle may come from quartz or mica, while the white grains are probably feldspar. A steel nail should not readily scratch quartz-rich grains, but feldspar may show cleavage surfaces.
Field identification & locations
Common worldwide, especially in exposed continental mountain belts; identify by its interlocking light grains and mixed quartz-feldspar-mica composition. It is not possible to confirm a specific mineral from this image alone.
