mineral

Polished orbicular jasper (likely ocean jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other silicate inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque orange-red, brown, green, and gray coloration with mottling or possible orbicules; vitreous to waxy polish; no obvious cleavage; cryptocrystalline structure; specific gravity roughly 2.55–2.70.

Identified August 30, 2026More mineral →

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At a glance

Common name: Polished orbicular jasper (likely ocean jasper)
Scientific name: Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other silicate inclusions
Category: mineral
Identified: August 30, 2026
Method: Standard

AI Estimated Value

Approximately $10–$40 for a palm-sized polished cabochon; exceptional pattern, provenance, or workmanship may reach $50–$150.

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

A silica-rich volcanic rock altered and silicified, with iron and manganese producing the warm colors; Madagascar ocean jasper formed in Miocene-era volcanic environments, though similar jasper occurs worldwide. Geological age depends on locality and cannot be confirmed from the image.

Uses & applications

Used for cabochons, beads, carvings, spheres, and decorative objects; attractive polished pieces have modest jewelry and collector value.

Geological facts

“Ocean jasper” is a trade name commonly applied to orbicular jasper from Madagascar, famous for concentric circular patterns and vivid colors. This specimen appears more mottled than strongly orbicular, so plume or brecciated jasper is also possible.

Field identification & locations

Identify by its opaque, dense body, multicolored iron-stained patterns, and lack of visible crystal faces; it should not scratch easily with a steel blade. Common sources include Madagascar, Mexico, India, Australia, and the United States.