igneous
Tumbled granite
Granite, chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, massive texture with pale pink/white feldspar, gray quartz, and dark mica or amphibole; vitreous to dull luster, no obvious cleavage as a whole, Mohs hardness about 6–7, and specific gravity roughly 2.63–2.75.
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Physical properties
Coarse-grained, massive texture with pale pink/white feldspar, gray quartz, and dark mica or amphibole; vitreous to dull luster, no obvious cleavage as a whole, Mohs hardness about 6–7, and specific gravity roughly 2.63–2.75.
Formation & geological history
Granite is an intrusive igneous rock formed when silica-rich magma cooled slowly deep within continental crust, producing visible crystals. Its exact age cannot be determined from the image; granite ranges from Precambrian to geologically recent.
Uses & applications
Used for countertops, building stone, monuments, paving, aggregate, and decorative tumbled specimens; this piece has modest lapidary and collecting value.
Geological facts
The rounded shape and polished surface indicate human tumbling, while the contrasting mineral patches are typical of weathered or altered granite.
Field identification & locations
Identify it by visible interlocking quartz and feldspar grains, pink coloration, and scattered dark minerals; common sources include continental mountain belts worldwide, especially India, Brazil, Canada, and the United States.
