igneous
Small weathered stone, possibly quartz-rich granite or feldspar
Indeterminate granitoid fragment; likely quartz (SiO₂) and feldspar, with minor mica or iron oxides
AI-generated identification · may be incorrectTan-brown, opaque, dull to slightly vitreous luster, irregular rounded shape, and no visible cleavage at this scale; estimated Mohs hardness 6–7 if quartz-bearing. Texture appears fine-grained or obscured by weathering.
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Physical properties
Tan-brown, opaque, dull to slightly vitreous luster, irregular rounded shape, and no visible cleavage at this scale; estimated Mohs hardness 6–7 if quartz-bearing. Texture appears fine-grained or obscured by weathering.
Formation & geological history
Likely an eroded fragment of igneous rock formed by slow cooling of silica-rich magma, commonly Precambrian to Phanerozoic in age; surface iron oxidation causes the brown coloration.
Uses & applications
As shown, it has little commercial value; similar granite is widely used for construction aggregate, paving, monuments, and countertops. Quartz-rich fragments may be retained as casual specimens.
Geological facts
The image does not provide enough detail for a reliable species-level identification; a fresh break, magnification, streak, and hardness test would help distinguish granite, quartzite, chert, or feldspar-rich rock.
Field identification & locations
Common in weathered gravel, soil, stream deposits, and glacial sediments worldwide. Estimated value: under $1 for an ordinary fragment, or roughly $2–$10 if confirmed and presented as an attractive labeled specimen.
