igneous
Rounded quartz-rich rock, likely granitic pebble
Weathered granite or granitic pegmatite; chiefly quartz (SiO₂) with feldspar and minor mica
AI-generated identification · may be incorrectLight cream-gray, coarse granular texture with visible interlocking crystals and dull-to-glassy luster; quartz hardness 7, feldspar 6, overall hardness about 6–7 Mohs. No obvious cleavage is visible because the specimen is naturally rounded and weathered.
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Physical properties
Light cream-gray, coarse granular texture with visible interlocking crystals and dull-to-glassy luster; quartz hardness 7, feldspar 6, overall hardness about 6–7 Mohs. No obvious cleavage is visible because the specimen is naturally rounded and weathered.
Formation & geological history
Likely crystallized slowly from silica-rich magma deep underground, then exposed and rounded by stream or glacial transport. Precise geological age and locality cannot be determined from the photograph.
Uses & applications
Common granite is used for aggregate, landscaping, countertops, and building stone; ordinary hand specimens generally have little commercial or collector value.
Geological facts
The pale grains are probably feldspar and quartz, while darker specks may be biotite or amphibole. The rounded shape and smoothed surface indicate significant physical weathering or transport.
Field identification & locations
Identify it by its speckled, interlocking quartz–feldspar texture, lack of layering, and inability to scratch quartz with a steel knife. Common worldwide, especially in granitic terrains and gravel deposits.
