igneous
Leopardite granite (likely orbicular granite)
Granite, chiefly quartz (SiO₂), feldspar, and biotite/hornblende; orbicules may reflect feldspar-rich concentric aggregates
AI-generated identification · may be incorrectCoarse-grained, mottled gray, cream, black, and greenish-brown; vitreous quartz and pearly feldspar luster, with interlocking crystals and no obvious cleavage as a whole. Hardness is approximately 6–7 Mohs; typical specific gravity is 2.6–2.8.
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Physical properties
Coarse-grained, mottled gray, cream, black, and greenish-brown; vitreous quartz and pearly feldspar luster, with interlocking crystals and no obvious cleavage as a whole. Hardness is approximately 6–7 Mohs; typical specific gravity is 2.6–2.8.
Formation & geological history
A silica-rich magma cooled slowly deep underground, producing large crystals; the rounded orbicular pattern formed through unusual mineral segregation during crystallization. Most examples are Precambrian to Paleozoic, depending on locality.
Uses & applications
Used as ornamental and dimension stone, countertops, monuments, and decorative polished slabs; attractive hand specimens are collected.
Geological facts
Orbicular granites are uncommon and prized for their concentric, eye-like patterns, sometimes marketed as leopardite or orbicular granite.
Field identification & locations
Identify it by its coarse interlocking texture, abundant light feldspar/quartz, dark mafic minerals, and rounded orbicules; a fresh surface and acid test can help distinguish it from weathered volcanic rock. Known localities include Finland, Madagascar, Corsica, and parts of North America.
