igneous
Rounded granite pebble
Granite, a coarse-grained felsic intrusive igneous rock, typically composed of quartz, feldspar, and mica
AI-generated identification · may be incorrectPinkish-white with visible light and dark mineral grains and a granular texture; minerals are mostly Mohs 6–7. Granite has no consistent cleavage as a whole and commonly has a specific gravity around 2.6–2.7; the pebble’s rounded shape suggests abrasion.
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Physical properties
Pinkish-white with visible light and dark mineral grains and a granular texture; minerals are mostly Mohs 6–7. Granite has no consistent cleavage as a whole and commonly has a specific gravity around 2.6–2.7; the pebble’s rounded shape suggests abrasion.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing crystals to grow; the specimen’s precise age and source cannot be determined from the photo. It may have been rounded during transport by water or ice.
Uses & applications
Granite is widely used for building stone, paving, countertops, monuments, and decorative aggregate; this small pebble is mainly suitable for collecting or landscaping.
Geological facts
The pink grains are likely feldspar, the glassier gray grains quartz, and dark flecks may be biotite or amphibole. Exact mineral identification would require closer examination.
Field identification & locations
Look for interlocking visible crystals and a mix of light quartz/feldspar with dark minerals; this rounded pebble is consistent with granite, though similar rocks such as granodiorite are possible. Granite occurs worldwide in continental crust and river or glacial deposits.
