igneous
Tumbled pink granite or feldspar-rich granitic pebble
Granite, composed mainly of quartz, potassium feldspar, and plagioclase; exact identification is uncertain from the image
AI-generated identification · may be incorrectPink-orange, fine-to-medium speckled texture with a dull to slightly polished luster; likely Mohs hardness 6–7, non-cleaving as a whole, with granular interlocking crystals and specific gravity about 2.6–2.7.
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Physical properties
Pink-orange, fine-to-medium speckled texture with a dull to slightly polished luster; likely Mohs hardness 6–7, non-cleaving as a whole, with granular interlocking crystals and specific gravity about 2.6–2.7.
Formation & geological history
Formed when silica-rich magma slowly cooled deep underground, commonly during Precambrian to Phanerozoic continental-crust formation; the rounded shape indicates natural abrasion or tumbling.
Uses & applications
Used as a decorative stone, landscaping pebble, aggregate, and occasionally in jewelry or craft work; this small specimen has little commercial value.
Geological facts
The pink color commonly comes from potassium feldspar, while darker flecks may be biotite or amphibole. A polished surface can make granite appear more uniform than it is.
Field identification & locations
Common in continental mountain belts and glacial or river gravels worldwide; identify it by visible interlocking grains, pink feldspar, and lack of layering or vesicles. A hand lens and streak, hardness, and acid tests can help distinguish it from jasper or dyed stone.
