igneous
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectLight gray-white with dark mineral flecks and a pinkish cast; granular, crystalline texture and no obvious cleavage. Typical hardness is about 6–7 Mohs; individual minerals have vitreous to pearly luster. The rounded shape indicates abrasion during transport or tumbling.
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Physical properties
Light gray-white with dark mineral flecks and a pinkish cast; granular, crystalline texture and no obvious cleavage. Typical hardness is about 6–7 Mohs; individual minerals have vitreous to pearly luster. The rounded shape indicates abrasion during transport or tumbling.
Formation & geological history
Formed as silica-rich magma cooled slowly underground, allowing visible crystals to grow. Its precise age and source cannot be determined from the image; granites occur in continental crust across many geological periods.
Uses & applications
Granite is widely used for building stone, paving, countertops, and monuments; small rounded pieces are also collected or used decoratively.
Geological facts
The dark flecks are likely biotite or another dark mineral, while the pale grains are feldspar and quartz.
Field identification & locations
Look for interlocking, visible grains and a mix of light and dark minerals; quartz is typically glassy and resists scratching. Granite occurs worldwide, and this pebble may have been naturally rounded or mechanically tumbled.
