igneous
Tumbled granite (pink granite pebble)
Felsic intrusive igneous rock; chiefly quartz, alkali feldspar, plagioclase, and minor biotite/hornblende
AI-generated identification · may be incorrectTypically Mohs 6–7; pink, white, gray, and black granular appearance, with a vitreous quartz luster and interlocking crystalline texture. The rounded shape indicates natural abrasion or tumbling; dark patches are likely mafic minerals or weathering.
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Physical properties
Typically Mohs 6–7; pink, white, gray, and black granular appearance, with a vitreous quartz luster and interlocking crystalline texture. The rounded shape indicates natural abrasion or tumbling; dark patches are likely mafic minerals or weathering.
Formation & geological history
Formed when silica-rich magma slowly crystallized deep underground, commonly during Precambrian to Phanerozoic continental plutonism. The pebble was later eroded, transported, and rounded.
Uses & applications
Widely used as building stone, countertops, monuments, aggregate, landscaping rock, and decorative tumbled stone; generally not valuable as jewelry.
Geological facts
Pink coloration usually comes from potassium feldspar, while black specks are biotite or hornblende. Granite is one of the most abundant continental crustal rocks.
Field identification & locations
Identify it by visible interlocking grains, abundant pink feldspar, glassy gray quartz, and scattered black minerals; it is common in continental mountain belts and glacial deposits worldwide.
