igneous
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock, mainly quartz, feldspar, and mica
AI-generated identification · may be incorrectRounded, pale gray-pink with dark mineral flecks and a granular texture; constituent minerals are typically Mohs 6–7, with vitreous quartz and feldspar cleavage. The small size and surface wear suggest a water-worn pebble.
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Physical properties
Rounded, pale gray-pink with dark mineral flecks and a granular texture; constituent minerals are typically Mohs 6–7, with vitreous quartz and feldspar cleavage. The small size and surface wear suggest a water-worn pebble.
Formation & geological history
Formed as silica-rich magma cooled slowly underground, allowing visible crystals to grow; granite bodies occur in ancient continental crust of many ages. The pebble was later rounded by transport in water or sediment.
Uses & applications
Granite is widely used for building stone, paving, countertops, and monuments; this small pebble is mainly a natural-history or collecting specimen.
Geological facts
Granite’s contrasting speckles come from interlocking crystals, commonly quartz, feldspar, and biotite or amphibole.
Field identification & locations
Look for a hard, visibly granular mix of light quartz/feldspar and darker minerals; granite pebbles are common in streams, beaches, and glacial deposits. A photo alone cannot confirm the exact rock type.
