igneous
Tumbled granite
Granite, chiefly quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectCoarse-grained, speckled white/pink and black; quartz and feldspar have Mohs hardness 6–7, mica about 2–3. Nonmetallic luster, massive texture, and no consistent cleavage as a whole; rounded and polished by tumbling.
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Physical properties
Coarse-grained, speckled white/pink and black; quartz and feldspar have Mohs hardness 6–7, mica about 2–3. Nonmetallic luster, massive texture, and no consistent cleavage as a whole; rounded and polished by tumbling.
Formation & geological history
An intrusive igneous rock formed when silica-rich magma slowly crystallized deep underground, commonly during Precambrian to Phanerozoic continental plutonism. The specimen is human-shaped and polished.
Uses & applications
Used for countertops, monuments, paving, aggregate, and decorative stones; small tumbled pieces are sold for collections and crafts.
Geological facts
The white grains are typically feldspar or quartz, while dark flakes or patches are biotite, hornblende, or other mafic minerals. Exact identification would require a closer view or testing.
Field identification & locations
Identify by visible interlocking light crystals with scattered dark minerals, unlike uniform marble or fine-grained basalt; common worldwide, especially in continental mountain belts. A steel scratch test generally does not scratch quartz but may mark softer feldspar or mica.
