sedimentary

Polished Ocean Jasper (orbicular jasper)

Siliceous microcrystalline quartz/chalcedony, mainly SiO₂, with iron- and manganese-rich inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque, waxy to glassy luster, with green-gray, pink, cream, and reddish orbicular patterns. It has cryptocrystalline quartz structure and no visible cleavage; specific gravity is roughly 2.55–2.70.

Identified August 10, 2026More sedimentary →

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At a glance

Common name: Polished Ocean Jasper (orbicular jasper)
Scientific name: Siliceous microcrystalline quartz/chalcedony, mainly SiO₂, with iron- and manganese-rich inclusions
Category: sedimentary
Identified: August 10, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small polished piece; $30–$150+ for larger, vividly patterned, high-quality specimens or carvings.

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 volcanic or hydrothermal fluids replace or cement earlier volcanic material, producing concentric orbicules and iron-oxide coloration. Most commercial Ocean Jasper comes from Oligocene–Miocene volcanic rocks of Madagascar, roughly 5–30 million years old.

Uses & applications

Used for cabochons, carvings, beads, polished pieces, and decorative objects; value is primarily ornamental and collectible rather than industrial.

Geological facts

Its distinctive “orbicular” spots are radial or concentric growth structures, not fossils. The name Ocean Jasper is a trade name associated especially with coastal Madagascar deposits.

Field identification & locations

Identify it by its hard, opaque chalcedony body and rounded pink, red, cream, or green orbicules; it should resist scratching by a steel knife. Common sources include Madagascar, Mexico, Australia, and Oregon.