sedimentary
Orbicular Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness 6.5-7 on Mohs scale, earthy to vitreous luster, opaque with distinct circular orbicular patterns, conchoidal fracture.
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Physical properties
Hardness 6.5-7 on Mohs scale, earthy to vitreous luster, opaque with distinct circular orbicular patterns, conchoidal fracture.
Formation & geological history
Formed through the slow deposition and crystallization of silica-rich fluids in volcanic cavities or fractures.
Uses & applications
Used primarily for ornamental carvings, polished display slabs, cabochons, and gemstone jewelry.
Geological facts
Also known as Ocean Jasper, specific varieties are mined exclusively along coastal Madagascar.
Field identification & locations
Identified by distinctive multi-colored concentric spheres or 'eyes' within a contrasting matrix; found in weathered volcanic deposits.
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