igneous
Rounded granitic pebble
Likely granite or granodiorite; exact identification is uncertain from the photograph.
AI-generated identification · may be incorrectCoarse-speckled dark gray and tan grains suggest quartz, feldspar, and dark mica or amphibole. Typical granite hardness is about 6–7 Mohs, with a granular crystalline texture and no obvious cleavage at pebble scale.
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Physical properties
Coarse-speckled dark gray and tan grains suggest quartz, feldspar, and dark mica or amphibole. Typical granite hardness is about 6–7 Mohs, with a granular crystalline texture and no obvious cleavage at pebble scale.
Formation & geological history
Likely formed as slowly cooled intrusive magma, then exposed and rounded by weathering and transport in water. Its age cannot be determined from appearance alone.
Uses & applications
Granite is used as crushed aggregate, paving and building stone, and decorative material; this small pebble is mainly suitable for collecting or landscaping.
Geological facts
Granite’s visible interlocking crystals record slow cooling underground; pebble rounding commonly results from prolonged abrasion during transport.
Field identification & locations
Look for interlocking light feldspar and quartz with darker minerals and a hard, scratch-resistant surface. Similar rocks occur widely in riverbeds and glacial deposits; confirm the identification with a fresh surface or mineral tests.
