igneous
Weathered granite or granitic gneiss pebble
Granite; chiefly quartz, feldspar, and biotite/hornblende
AI-generated identification · may be incorrectCoarse, speckled pink-brown stone with interlocking crystals, vitreous-to-dull luster, and no obvious cleavage as a whole; constituent feldspar has Mohs hardness ~6, quartz ~7. Rounded edges indicate natural abrasion or tumbling.
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Physical properties
Coarse, speckled pink-brown stone with interlocking crystals, vitreous-to-dull luster, and no obvious cleavage as a whole; constituent feldspar has Mohs hardness ~6, quartz ~7. Rounded edges indicate natural abrasion or tumbling.
Formation & geological history
Crystallized slowly from silica-rich magma, commonly during Precambrian to Phanerozoic continental crust formation; later weathering and stream or glacial transport rounded it.
Uses & applications
Common granite is used for aggregate, building stone, monuments, countertops, and landscaping; this small specimen has mainly educational or modest collecting value.
Geological facts
The pink coloration generally comes from potassium feldspar, while dark flecks are likely biotite or amphibole. Surface iron staining produces the rusty brown appearance.
Field identification & locations
Identify it by visible interlocking pink/white/gray crystals and dark mica or amphibole grains; granite is widespread in continental terrains worldwide, especially Canada, Scandinavia, India, and the United States.
