mineral

Polished orbicular jasper (possibly ocean jasper)

Orbicular jasper, a microcrystalline quartz variety (SiO₂); exact variety cannot be confirmed from the photo

AI-generated identification · may be incorrect

The small rounded, polished specimen has a dark green-gray ground with colorful concentric orbicules. Jasper is typically opaque, Mohs hardness about 6.5–7, with a waxy to vitreous polish and no visible cleavage; the circles may be mineral-filled cavities or spherulitic growths.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids or volcanic processes formed the microcrystalline quartz and orbicular patterns; the precise geological age and locality cannot be determined visually.

Uses & applications

Used for beads, cabochons, ornaments, and collecting; this appears to be a polished decorative stone.

Geological facts

“Ocean jasper” is a trade name commonly applied to orbicular jasper from Madagascar, but orbicular patterns occur in other jasper deposits too.

Field identification & locations

Look for opaque silica-rich material, hardness near 7, and distinctive rounded rings; a locality label or mineral testing is needed to identify the variety reliably.