igneous
Rounded granitic pebble
Granite, a coarse-grained intrusive igneous rock composed mainly of quartz, feldspar, and minor mica or other dark minerals
AI-generated identification · may be incorrectPale gray to white with scattered darker and pinkish grains; granular texture and dull to slightly glassy mineral luster. Individual minerals are typically Mohs 6–7 (quartz); rock has no consistent cleavage and is relatively dense and hard.
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Physical properties
Pale gray to white with scattered darker and pinkish grains; granular texture and dull to slightly glassy mineral luster. Individual minerals are typically Mohs 6–7 (quartz); rock has no consistent cleavage and is relatively dense and hard.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing visible mineral grains to crystallize; granite ranges from Precambrian to recent geologic ages. Its rounded shape likely formed through weathering and abrasion during transport by water or ice.
Uses & applications
Granite is widely used for building stone, paving, countertops, and aggregate; this small pebble is mainly suitable for collecting or decoration.
Geological facts
Granite is a rock rather than a single mineral, and its quartz grains can scratch glass.
Field identification & locations
Look for interlocking light-colored feldspar and quartz grains with sparse darker minerals; common in granitic terrains and river, beach, or glacial deposits. The smooth rounded outline indicates transport and abrasion.
