igneous
Polished orbicular granite (likely larvikite or gabbroic granite)
Granite-group rock; chiefly feldspar, quartz, and dark pyroxene/amphibole minerals
AI-generated identification · may be incorrectMedium- to coarse-grained, orange-brown and black mottling with a wet polished luster; typical hardness about 6–7 Mohs, massive texture, no obvious cleavage on the rounded surface, and specific gravity roughly 2.7–3.0.
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Physical properties
Medium- to coarse-grained, orange-brown and black mottling with a wet polished luster; typical hardness about 6–7 Mohs, massive texture, no obvious cleavage on the rounded surface, and specific gravity roughly 2.7–3.0.
Formation & geological history
An intrusive igneous rock that crystallized slowly from magma deep underground, probably during Precambrian or younger continental crust formation; the specimen has been rounded and polished by human processing.
Uses & applications
Used for decorative stone, countertops, monuments, cabochons, worry stones, and collectors’ polished specimens; not generally valuable as a gemstone.
Geological facts
The orange areas are likely potassium feldspar or weathered feldspar, while black grains are commonly pyroxene, amphibole, or biotite. Its precise identity cannot be confirmed from a photograph alone.
Field identification & locations
Identify by its interlocking granular texture, abundant feldspar, dark mafic grains, and lack of layering or fossils; common sources include India, Madagascar, Norway, Brazil, and Finland. A streak, hardness, and mineral inspection would help distinguish granite from gabbro or larvikite.
