igneous
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica
AI-generated identification · may be incorrectMohs hardness about 6–7; mottled cream, gray, and brown with a granular texture and dull to vitreous mineral grains. Crystals are interlocking and visible; no regular cleavage as a whole rock.
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Physical properties
Mohs hardness about 6–7; mottled cream, gray, and brown with a granular texture and dull to vitreous mineral grains. Crystals are interlocking and visible; no regular cleavage as a whole rock.
Formation & geological history
Magma cooled slowly beneath Earth’s surface, allowing crystals to grow; granite bodies form across many geological ages. The rounded shape likely results from transport and abrasion, but the source and age cannot be determined from the image.
Uses & applications
Used as building and paving stone, countertops, aggregate, and decorative material; small specimens are mainly collected or kept as curiosities.
Geological facts
Quartz and feldspar make up most granite, while minor dark minerals such as biotite create speckles.
Field identification & locations
Look for interlocking light-colored quartz and feldspar grains with scattered darker mica; granite is common in continental crust and river or beach gravels. The image’s rounded, weathered specimen is consistent with granite, though exact identification requires close inspection.
