igneous
Tumbled granite (likely weathered granite pebble)
Granite; chiefly quartz, feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse-grained, orange-pink matrix with dark mineral flecks; likely Mohs 6–7, vitreous to dull luster, no obvious cleavage as a whole, and specific gravity about 2.6–2.7. Its rounded shape and smooth surface indicate natural water wear or tumbling.
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Physical properties
Coarse-grained, orange-pink matrix with dark mineral flecks; likely Mohs 6–7, vitreous to dull luster, no obvious cleavage as a whole, and specific gravity about 2.6–2.7. Its rounded shape and smooth surface indicate natural water wear or tumbling.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, commonly during Precambrian to Phanerozoic intrusive events. Weathering and transport rounded this specimen; the exact age cannot be determined visually.
Uses & applications
Used widely as dimension stone, countertops, monuments, aggregate, and landscaping rock; this small piece has modest decorative or educational value.
Geological facts
Pink/orange coloration commonly comes from potassium feldspar, while black grains are biotite or amphibole and translucent grains may be quartz.
Field identification & locations
Identify it by visible interlocking grains, pink feldspar, gray/translucent quartz, and dark mica or amphibole; a glassy scratch test should not scratch quartz. Common worldwide, especially in continental mountain belts.
