mineral

Tumbled orbicular jasper (likely ocean jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron oxides and other accessory minerals

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque, rounded, and polished, with salmon-pink, cream, gray, and black mottling. Waxy to glassy luster; cryptocrystalline quartz with no visible cleavage and conchoidal fracture.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich volcanic fluids replace or fill cavities in volcanic rock, producing orbicular patterns and iron-oxide coloration; most classic ocean jasper formed in Miocene volcanic rocks of Madagascar.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and lapidary specimens; not generally used structurally.

Geological facts

The image’s rounded polish and multicolored pattern strongly suggest jasper, though the exact variety cannot be confirmed visually; it may also be a similar brecciated or iron-stained chalcedony.

Field identification & locations

Identify by its opaque microcrystalline texture, high polish, hardness, and inability to scratch with a steel knife easily; ocean jasper commonly comes from Madagascar, while jasper occurs worldwide.