mineral

Orbicular jasper (likely ocean jasper)

Silica-rich microcrystalline quartz/chalcedony with iron-oxide and feldspar inclusions; commonly marketed as Ocean Jasper

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; brown to reddish-brown matrix with white orbicular patches, vitreous-to-waxy luster, opaque, and no obvious cleavage. The rounded polished form is a tumbled or carved specimen.

Identified August 10, 2026More mineral →

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At a glance

Common name: Orbicular jasper (likely ocean jasper)
Scientific name: Silica-rich microcrystalline quartz/chalcedony with iron-oxide and feldspar inclusions; commonly marketed as Ocean Jasper
Category: mineral
Identified: August 10, 2026
Method: Standard

AI Estimated Value

Typically $10–$50 for a small polished sphere; approximately $50–$200+ for larger, attractive, well-patterned 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

Forms through silica-rich volcanic activity and subsequent replacement or filling of cavities, with concentric mineral growth and iron staining; Madagascar Ocean Jasper is mainly Oligocene–Miocene in age (roughly 23–2.6 million years).

Uses & applications

Used for cabochons, beads, spheres, carvings, and decorative objects; valued primarily as an ornamental gemstone rather than for industrial use.

Geological facts

“Ocean Jasper” is a commercial name covering several orbicular jasper varieties, and its characteristic circles arise from radiating or concentric chalcedony and feldspar/quartz growth.

Field identification & locations

Identify it by its opaque brown chalcedony matrix and contrasting cream-white orbicules; Madagascar is the classic source, though similar orbicular jasper occurs in Australia, Mexico, and elsewhere. A polished surface can obscure texture and hardness tests.