igneous
Pink granite pebble
Granite, chiefly quartz–alkali feldspar–plagioclase with biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, speckled pink, white, gray, and black; typically Mohs 6–7, vitreous quartz and feldspar luster, no consistent cleavage as a rock, and specific gravity about 2.6–2.7.
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Physical properties
Coarse-grained, speckled pink, white, gray, and black; typically Mohs 6–7, vitreous quartz and feldspar luster, no consistent cleavage as a rock, and specific gravity about 2.6–2.7.
Formation & geological history
A slowly cooled intrusive igneous rock formed when silica-rich magma crystallized deep underground, generally during Precambrian to Phanerozoic mountain-building; this rounded specimen was later transported and weathered.
Uses & applications
Used widely for building stone, countertops, monuments, paving, aggregate, and landscaping; small polished pieces are inexpensive study or décor specimens.
Geological facts
Pink color usually reflects potassium feldspar, while gray translucent grains are quartz and dark flakes are biotite or amphibole.
Field identification & locations
Identify it by visible interlocking crystals and the quartz–feldspar–mica combination; common in continental mountain belts and glacial or river gravels worldwide. A hand lens and streak/acid tests help distinguish it from similar gneiss or quartzite.
