igneous
Polished pink granite pebble
Granite, typically quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectHardness about 6–7 Mohs; salmon-pink, fine- to medium-grained, with a granular texture and subdued vitreous-to-waxy polish. Likely contains potassium feldspar, quartz, plagioclase, and minor biotite or iron oxides; no obvious cleavage as a whole rock.
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Physical properties
Hardness about 6–7 Mohs; salmon-pink, fine- to medium-grained, with a granular texture and subdued vitreous-to-waxy polish. Likely contains potassium feldspar, quartz, plagioclase, and minor biotite or iron oxides; no obvious cleavage as a whole rock.
Formation & geological history
A slowly cooled intrusive igneous rock formed when silica-rich magma crystallized deep in the crust, commonly during Precambrian to younger continental plutonic events. The rounded form reflects natural abrasion or tumbling, and the surface appears polished or coated.
Uses & applications
Used as aggregate, building stone, countertops, monuments, landscaping stone, and decorative specimens; small polished pieces are inexpensive collectibles.
Geological facts
The pink color generally comes from potassium feldspar, while darker flecks commonly represent biotite or amphibole. The visible pale patch may be a feldspar-rich area, surface abrasion, or a coating defect.
Field identification & locations
Identify it by interlocking pink feldspar and gray/clear quartz grains, strong durability, and lack of layering or fossils; a streak and acid test are usually unnecessary. Common sources include granite terrains worldwide, especially India, Brazil, Scandinavia, and North America.
