mineral

Polished ocean jasper (orbicular jasper)

Silicified microcrystalline quartz/chalcedony (SiO₂), commonly with iron oxides and other inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque gray-green to brown with cream/white orbicular patches, waxy to glossy luster, and no visible cleavage. The rounded, polished cabochon shape indicates human processing.

Identified August 30, 2026More mineral →

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At a glance

Common name: Polished ocean jasper (orbicular jasper)
Scientific name: Silicified microcrystalline quartz/chalcedony (SiO₂), commonly with iron oxides and other inclusions
Category: mineral
Identified: August 30, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a small polished cabochon; $30–$150+ for exceptional pattern, color, or verified rare locality material.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Forms when silica-rich fluids replace volcanic rock and fill cavities, producing concentric orbicular patterns; most classic material comes from O火? Madagascar, generally associated with Cenozoic volcanic rocks. Exact geological age depends on locality.

Uses & applications

Used for cabochons, pendants, beads, carvings, and lapidary collections; not generally used as a structural stone.

Geological facts

Ocean jasper is a trade name rather than a single strict mineral species; its distinctive orbs arise from rhythmic silica deposition, replacement, and mineral inclusions.

Field identification & locations

Identify by its opaque chalcedony-like body, rounded orbicular markings, glassy polish, and inability to scratch with a fingernail or copper coin. Common sources include Madagascar, Mexico, Australia, and Oregon; locality confirmation requires testing or provenance.