igneous
Weathered pink granite pebble
Granite, chiefly quartz, feldspar, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, mottled pink, white, and dark brown; typically vitreous-to-dull luster, interlocking crystals, no consistent cleavage as a whole, Mohs hardness about 6–7, and specific gravity 2.63–2.75.
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Physical properties
Coarse-grained, mottled pink, white, and dark brown; typically vitreous-to-dull luster, interlocking crystals, no consistent cleavage as a whole, Mohs hardness about 6–7, and specific gravity 2.63–2.75.
Formation & geological history
An intrusive felsic igneous rock crystallized slowly from silica-rich magma deep in Earth’s crust, generally during Precambrian to Phanerozoic events; this pebble was later rounded by weathering and transport.
Uses & applications
Used widely as dimension stone, countertops, monuments, building aggregate, and landscaping rock; small attractive pieces have modest collector value.
Geological facts
The pink color commonly comes from potassium feldspar, while dark grains are usually biotite or amphibole. The specimen’s rounded shape and surface staining indicate prolonged surface weathering or stream/beach transport.
Field identification & locations
Likely granite if the visible grains are crystalline and interlocking; a hand lens should reveal translucent quartz, pink feldspar, and dark mica. Common worldwide, especially in granitic mountain and glacial regions.
