sedimentary

Orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz/chalcedony, commonly called Ocean Jasper; predominantly SiO₂ with iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque cream, pink, red, and brown coloration with dark orbicular patches; waxy to dull luster and no visible cleavage. The rounded shape appears tumbled or naturally water-worn.

Identified August 14, 2026More sedimentary →

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At a glance

Common name: Orbicular jasper (likely ocean jasper)
Scientific name: Silicified microcrystalline quartz/chalcedony, commonly called Ocean Jasper; predominantly SiO₂ with iron-oxide inclusions
Category: sedimentary
Identified: August 14, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 for a small tumbled piece; $30–$150+ for attractive patterned polished specimens or cabochons.

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 through silica-rich replacement and cementation of volcanic or sedimentary material, with iron and manganese producing the red-brown patterns. Ocean Jasper is chiefly associated with Oligocene–Miocene volcanic rocks of Madagascar.

Uses & applications

Used for cabochons, beads, carvings, polished specimens, and lapidary collections; too variable and small for construction use.

Geological facts

Orbicular patterns result from concentric silica growth around nuclei, though similar-looking jasper varieties can occur worldwide. “Ocean Jasper” is a trade name rather than a strict mineral species.

Field identification & locations

Identify by its opaque chalcedony-like body, high polish, hardness, and orbicular red/cream pattern; test cautiously with a steel file or inspect for glassy conchoidal fracture. Common sources include Madagascar, Mexico, Australia, and the western United States.