igneous
Likely weathered granite or granitic pegmatite fragment
Granite; primarily quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectLight gray, coarse-grained, granular texture with a dull to weakly vitreous luster; individual crystals are visible but indistinct in the photo. Hardness is approximately 6–7 Mohs; no obvious cleavage as a whole rock, though feldspar and mica have cleavage; specific gravity about 2.6–2.7.
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Physical properties
Light gray, coarse-grained, granular texture with a dull to weakly vitreous luster; individual crystals are visible but indistinct in the photo. Hardness is approximately 6–7 Mohs; no obvious cleavage as a whole rock, though feldspar and mica have cleavage; specific gravity about 2.6–2.7.
Formation & geological history
Formed when silica-rich magma slowly crystallized deep underground, generally during Precambrian to Phanerozoic continental crust formation; surface weathering produced its rounded, rough appearance.
Uses & applications
Used widely as crushed aggregate, building stone, monuments, and countertops; small unattractive fragments have negligible jewelry or collector value.
Geological facts
The pale, speckled appearance is typical of quartz–feldspar-rich felsic rock, but the image is insufficient to distinguish granite from quartz-rich metamorphic rock or concrete with certainty.
Field identification & locations
Look for interlocking quartz, feldspar, and mica grains rather than cement, bubbles, or uniform manufactured texture; common worldwide, especially in continental shield and mountain regions. Estimated value: $0–$5 as an ordinary fragment; attractive polished pieces may sell for $5–$20.
