mineral

Orbicular jasper (likely ocean jasper)

Silica-rich microcrystalline quartz/chalcedony with iron-oxide and other mineral inclusions; SiO₂

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque cream, tan, and gray with dark branching or orbicular patterns; vitreous to waxy luster, cryptocrystalline structure, and no visible cleavage. The rounded shape indicates natural water-worn material or tumbling.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich volcanic fluids or ash lithify and later develop iron- and manganese-rich inclusions, brecciation, or orbicular textures. Classic ocean jasper formed in volcanic rocks of Madagascar, chiefly Mesozoic to Cenozoic in age.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and lapidary display; not generally used as structural stone. Value depends on pattern, polish, color, and provenance.

Geological facts

The image most strongly suggests orbicular or scenic jasper, though exact identification requires a close examination of texture and a hardness or specific-gravity test. Jasper is an opaque variety of chalcedony rather than a single mineral species.

Field identification & locations

Look for opaque silica, smooth conchoidal fracture, waxy/vitreous luster, and resistance to scratching by steel; calcite or limestone would be much softer. Common sources include Madagascar, Oregon, Idaho, Mexico, Brazil, and India.