igneous
Rounded granite or granitic gneiss pebble
Granite, chiefly quartz, feldspar, and mica; exact identification requires testing
AI-generated identification · may be incorrectCoarse, speckled gray-brown rock with visible dark mica/amphibole and light quartz/feldspar; typically Mohs 6–7, granular crystalline texture, vitreous to dull luster, and no obvious cleavage as a whole rock.
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Physical properties
Coarse, speckled gray-brown rock with visible dark mica/amphibole and light quartz/feldspar; typically Mohs 6–7, granular crystalline texture, vitreous to dull luster, and no obvious cleavage as a whole rock.
Formation & geological history
Likely an ice- or water-rounded glacial/stream cobble derived from intrusive granite formed by slow cooling of magma, commonly Precambrian to Mesozoic in age depending on locality.
Uses & applications
Used as landscaping stone, aggregate, paving material, and decorative polished stone; this small ordinary pebble has minimal commercial value.
Geological facts
The rounded shape and weathered surface obscure its original grain boundaries; a fresh break or thin section would distinguish granite from granitic gneiss or similar granitoids.
Field identification & locations
Look for interlocking pink/white feldspar, translucent gray quartz, and black mica or hornblende; granite is common in continental shields, mountain belts, glacial deposits, and stream beds worldwide.
