igneous
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock; likely quartz, feldspar, and dark mica or amphibole
AI-generated identification · may be incorrectGray, speckled, and granular with a dull to slightly glassy luster; visible grains suggest interlocking crystals. Typical Mohs hardness is about 6–7, with no consistent cleavage as a whole rock.
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Physical properties
Gray, speckled, and granular with a dull to slightly glassy luster; visible grains suggest interlocking crystals. Typical Mohs hardness is about 6–7, with no consistent cleavage as a whole rock.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing crystals to grow. The pebble’s exact age and source cannot be determined from the image.
Uses & applications
Granite is widely used for building stone, paving, countertops, and aggregate; this rounded specimen is mainly suitable for collecting or display.
Geological facts
Granite’s light minerals are generally quartz and feldspar, while dark flecks commonly come from biotite or amphibole.
Field identification & locations
Its rounded shape suggests abrasion during transport by water or glacial action. Look for interlocking light and dark mineral grains; common sources include granitic outcrops, riverbeds, and glacial deposits.
