igneous
Weathered granite pebble
Granite, a quartz–feldspar–mica intrusive rock
AI-generated identification · may be incorrectCoarse-grained, pale gray-white rock with orange-brown iron-oxide staining. Likely hardness 6–7 Mohs; quartz and feldspar have vitreous to dull luster and no consistent cleavage as a whole rock.
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Physical properties
Coarse-grained, pale gray-white rock with orange-brown iron-oxide staining. Likely hardness 6–7 Mohs; quartz and feldspar have vitreous to dull luster and no consistent cleavage as a whole rock.
Formation & geological history
Granite crystallizes slowly from silica-rich magma underground, commonly in continental crust; its age cannot be determined from the image. The rounded shape suggests abrasion during transport, and the rusty surface reflects weathering of iron-bearing minerals.
Uses & applications
Granite is widely used as building and paving stone, countertops, monuments, and decorative aggregate; this small weathered pebble is mainly a curiosity or craft specimen.
Geological facts
Granite typically contains quartz, potassium feldspar, plagioclase, and smaller amounts of mica or other minerals. The orange coating is likely iron oxides formed as minerals weathered.
Field identification & locations
Look for interlocking visible crystals, especially glassy quartz and pale feldspar, with occasional dark mica; the rusty coloration may be surface staining. Granite occurs worldwide in continental mountain belts and exposed ancient crust.
