igneous
Weathered granite pebble
Granitic rock, chiefly quartz, potassium feldspar, plagioclase, and mica/hornblende
AI-generated identification · may be incorrectCoarse, speckled crystalline texture with pale pink-white feldspar, translucent gray quartz, and dark mica or amphibole; typically Mohs 6–7, vitreous to dull luster, no consistent cleavage as a rock, and specific gravity about 2.6–2.7.
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Physical properties
Coarse, speckled crystalline texture with pale pink-white feldspar, translucent gray quartz, and dark mica or amphibole; typically Mohs 6–7, vitreous to dull luster, no consistent cleavage as a rock, and specific gravity about 2.6–2.7.
Formation & geological history
Slow cooling of silica-rich magma produced interlocking crystals, commonly during Precambrian to Phanerozoic continental plutonism; rounding and surface alteration occurred through weathering and stream or glacial transport.
Uses & applications
Used for building stone, countertops, monuments, aggregate, and landscaping; this rounded specimen has little commercial value but may be useful as a teaching or collection sample.
Geological facts
The pink coloration commonly reflects potassium feldspar, while dark grains are biotite mica or hornblende. Granitic rocks are among the most abundant continental crust materials.
Field identification & locations
Identify it by visible interlocking grains, abundant light feldspar and quartz, and scattered dark minerals; granite pebbles occur widely in rivers, beaches, glacial deposits, and weathered outcrops. The image does not support a precise locality or variety.
