igneous
Tumbled pink granite
Granite, primarily quartz, feldspar, and mica; likely pink alkali-feldspar granite
AI-generated identification · may be incorrectCoarse crystalline texture with pink-red feldspar, gray/clear quartz, and dark mica or amphibole; vitreous to pearly luster, Mohs hardness about 6–7, no prominent cleavage as a rock, and specific gravity roughly 2.6–2.7. The rounded shape and sheen indicate mechanical tumbling and polishing.
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Physical properties
Coarse crystalline texture with pink-red feldspar, gray/clear quartz, and dark mica or amphibole; vitreous to pearly luster, Mohs hardness about 6–7, no prominent cleavage as a rock, and specific gravity roughly 2.6–2.7. The rounded shape and sheen indicate mechanical tumbling and polishing.
Formation & geological history
An intrusive igneous rock formed when silica-rich magma cooled slowly deep within Earth, allowing visible crystals to grow; most granite formed during Precambrian to Phanerozoic continental activity. Weathering and later tumbling produced the present shape.
Uses & applications
Used widely for countertops, monuments, building stone, paving, aggregate, and decorative rock; polished pieces are inexpensive collectibles and craft materials.
Geological facts
Pink coloration commonly comes from potassium-rich feldspar, while dark specks are biotite mica or hornblende. Exact identification is limited because the specimen is small, rounded, and partly weathered.
Field identification & locations
Identify granite by its visibly interlocking grains and mixed pink, gray, white, and black minerals; unlike uniform quartzite, it is compositionally varied. Common worldwide, especially in continental shields and mountain batholiths.
