igneous
Rounded granite pebble
Granite, a coarse-grained felsic intrusive igneous rock
AI-generated identification · may be incorrectTypically composed of quartz, feldspar, and mica; hardness about 6–7 Mohs. The specimen is rounded and mottled gray, cream, and black, with a granular texture and no visible cleavage.
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Physical properties
Typically composed of quartz, feldspar, and mica; hardness about 6–7 Mohs. The specimen is rounded and mottled gray, cream, and black, with a granular texture and no visible cleavage.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing crystals to grow; granite ranges from ancient Precambrian formations to much younger bodies. The pebble’s smooth shape likely developed through transport and abrasion in water or glacial debris.
Uses & applications
Granite is widely used as building and paving stone, countertops, monuments, and aggregate; this small pebble is mainly suitable for collecting or landscaping.
Geological facts
Granite’s visible grains record slow cooling at depth. Its rounded shape reflects later erosion rather than its original formation.
Field identification & locations
Look for interlocking light-colored feldspar and quartz grains with scattered dark mica or amphibole; a hand lens can help confirm the granular texture. Granite occurs worldwide, especially in continental crust and mountain belts.
