igneous
Weathered granite pebble
Granite, a quartz–feldspar–mica plutonic rock
AI-generated identification · may be incorrectTypically 6–7 Mohs; pale pink, cream, gray, and reddish mottling; granular texture with vitreous quartz and feldspar, generally no cleavage as a whole rock. The rounded shape and surface staining indicate prolonged stream abrasion and weathering.
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Physical properties
Typically 6–7 Mohs; pale pink, cream, gray, and reddish mottling; granular texture with vitreous quartz and feldspar, generally no cleavage as a whole rock. The rounded shape and surface staining indicate prolonged stream abrasion and weathering.
Formation & geological history
Formed when silica-rich magma cooled slowly deep underground, producing interlocking quartz, feldspar, and mica crystals, commonly during Precambrian to Phanerozoic continental uplift. The specimen was later transported and rounded in a stream or gravel deposit.
Uses & applications
Used widely as crushed aggregate, building stone, paving, monuments, and landscaping; attractive polished pieces are collected but this ordinary pebble has minimal commercial value.
Geological facts
Pink coloration commonly comes from potassium feldspar, while dark specks may be biotite or hornblende and reddish patches may be iron-oxide staining. The image is not sharp enough to confirm the exact mineral proportions.
Field identification & locations
Identify it by its coarse interlocking grains, mixed pink-white-gray color, and lack of layering or vesicles; a hand lens should reveal glassy quartz and blocky feldspar. Common worldwide in streambeds draining granitic terrain.
