igneous
Quartz-rich granite or granitic pegmatite fragment
Granite, chiefly quartz (SiO₂), feldspar, and minor mica
AI-generated identification · may be incorrectLight gray-white, coarse crystalline, with a granular texture and vitreous-to-dull luster; typical hardness is about 6–7 Mohs, no prominent cleavage as a whole, and specific gravity around 2.6–2.7. The image is low-resolution, so exact mineral proportions are uncertain.
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Physical properties
Light gray-white, coarse crystalline, with a granular texture and vitreous-to-dull luster; typical hardness is about 6–7 Mohs, no prominent cleavage as a whole, and specific gravity around 2.6–2.7. The image is low-resolution, so exact mineral proportions are uncertain.
Formation & geological history
Formed when silica-rich magma slowly cooled underground, allowing visible crystals to grow; most exposed granite formed during Precambrian to Phanerozoic continental crust development. Weathering may have rounded and roughened this fragment.
Uses & applications
Commonly used as crushed stone, aggregate, building stone, countertops, monuments, and landscaping material; ordinary fragments have negligible jewelry value.
Geological facts
Granite’s visible speckled texture reflects interlocking quartz and feldspar crystals. Its white appearance may also indicate a quartz-feldspar-rich pegmatite rather than typical granite.
Field identification & locations
Identify it by its hard, gritty, interlocking grains and inability to scratch easily with a steel nail; quartz grains can scratch glass. Common worldwide in continental mountain belts and exposed shields.
