mineral

Orbicular jasper (likely ocean jasper)

Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and possibly feldspar or zeolite inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, cream, and black orbicular pattern; waxy to dull luster; cryptocrystalline quartz with no visible cleavage. The rounded, polished surface appears water-worn or tumbled.

Identified September 10, 2026More mineral →

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At a glance

Common name: Orbicular jasper (likely ocean jasper)
Scientific name: Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and possibly feldspar or zeolite inclusions
Category: mineral
Identified: September 10, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common palm-sized specimen; $30–$150+ for especially vivid, well-patterned material or quality polished pieces.

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

Formed from silica-rich volcanic material, probably by hydrothermal alteration and repeated deposition around inclusions or cavities; classic ocean jasper formed in Oligocene–Miocene volcanic rocks of Madagascar. Exact locality cannot be confirmed from the image.

Uses & applications

Used for cabochons, carvings, polished specimens, and decorative stone; too irregular and opaque for faceted gemstones. Commonly collected for its orbicular pattern.

Geological facts

Orbicular jasper is prized for concentric “eye” patterns produced by contrasting mineral growth. The pictured specimen may also be a related orbicular rhyolite or jasper breccia rather than true ocean jasper.

Field identification & locations

Identify by testing for glassy/waxy silica texture, lack of cleavage, strong resistance to scratching, and orb-like color bands; common sources include Madagascar, Mexico, Australia, and the western United States. Avoid acid and use a streak test cautiously, since alteration minerals can vary.