igneous
Pink granite pebble
Granite, a coarse-grained felsic intrusive igneous rock, typically composed of quartz, potassium feldspar, plagioclase, and mica
AI-generated identification · may be incorrectRounded, mottled pink, white, and dark grains with a granular texture and subdued luster. Individual mineral hardnesses are about 2–7 on the Mohs scale; granite has no consistent cleavage and typically has specific gravity around 2.6–2.7.
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Physical properties
Rounded, mottled pink, white, and dark grains with a granular texture and subdued luster. Individual mineral hardnesses are about 2–7 on the Mohs scale; granite has no consistent cleavage and typically has specific gravity around 2.6–2.7.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing visible crystals to grow. Granite occurs in continental crust of many ages; the pebble’s exact age and source cannot be determined from the image.
Uses & applications
Granite is widely used for countertops, paving, building stone, and monuments; small polished pebbles are used decoratively and collected.
Geological facts
The pink color commonly comes from potassium feldspar, while glassy gray grains may be quartz and dark flecks often mica or amphibole.
Field identification & locations
The rounded shape suggests transport by water or glacial action. Look for interlocking, visible grains and a mix of light and dark minerals; common sources include streambeds, beaches, and glacial deposits.
