igneous
Polished pink granite pebble
Granite, primarily quartz, alkali feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, mottled pink-gray appearance with visible interlocking crystals; typically Mohs 6–7, vitreous quartz luster, no preferred cleavage as a whole, and specific gravity about 2.63–2.75.
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Physical properties
Coarse-grained, mottled pink-gray appearance with visible interlocking crystals; typically Mohs 6–7, vitreous quartz luster, no preferred cleavage as a whole, and specific gravity about 2.63–2.75.
Formation & geological history
An intrusive igneous rock formed by slow cooling of silica-rich magma deep in continental crust, commonly during Precambrian to younger continental mountain-building events; this specimen has been naturally water-worn or polished.
Uses & applications
Used widely for countertops, monuments, building stone, paving, and landscaping; attractive polished pebbles are inexpensive decorative or educational specimens.
Geological facts
The pink color generally comes from potassium feldspar, while dark flecks are biotite or amphibole and translucent grains are quartz.
Field identification & locations
Identify it by its visible interlocking pink, white/gray, and black crystals and hard, granular texture; common worldwide, especially in continental shields and mountain belts. Typical value is $2–$15 for a small polished pebble, or $10–$40 for an unusually attractive specimen.
