igneous
Polished orbicular granite (likely snowflake granite)
Granite, chiefly quartz, potassium feldspar, plagioclase, and dark biotite/amphibole minerals
AI-generated identification · may be incorrectMedium- to coarse-grained, black-and-cream mottled pattern with a polished luster; interlocking crystals, no obvious cleavage as a whole, Mohs hardness about 6–7, and specific gravity roughly 2.6–2.8.
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Physical properties
Medium- to coarse-grained, black-and-cream mottled pattern with a polished luster; interlocking crystals, no obvious cleavage as a whole, Mohs hardness about 6–7, and specific gravity roughly 2.6–2.8.
Formation & geological history
An intrusive igneous rock that crystallized slowly from silica-rich magma deep underground, generally during Precambrian to Phanerozoic continental magmatism; the rounded shape and shine indicate human polishing.
Uses & applications
Used for countertops, facing stone, monuments, decorative objects, cabochons, and lapidary specimens. Common polished pieces are collectible mainly for their pattern and finish.
Geological facts
The pale areas are feldspar and quartz, while the dark patches are mafic minerals; the contrasting texture is typical of granite rather than a single mineral crystal.
Field identification & locations
Identify it by visible interlocking grains and its salt-and-pepper pattern; granite is widespread in continental mountain belts and shield regions worldwide. A thin-section or mineral test would be needed to distinguish ordinary mottled granite from true orbicular varieties.
