mineral

Polished orbicular jasper (likely ocean jasper)

Microcrystalline quartz (SiO₂) with chalcedony, iron oxides, and orbicular alteration textures

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque cream, red, brown, and gray colors with concentric orbicules; vitreous to waxy luster and no visible cleavage. The specimen is naturally rounded and polished, exposing strongly patterned silica-rich bands.

Identified August 30, 2026More mineral →

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At a glance

Common name: Polished orbicular jasper (likely ocean jasper)
Scientific name: Microcrystalline quartz (SiO₂) with chalcedony, iron oxides, and orbicular alteration textures
Category: mineral
Identified: August 30, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small polished common piece; $30–$150+ for large, vividly patterned, confirmed ocean-jasper specimens.

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 and cement volcanic material, producing chalcedony and iron-oxide orbicules; many ocean-jasper varieties formed in Miocene volcanic rocks of Madagascar. Exact age and locality cannot be confirmed from the image.

Uses & applications

Used for cabochons, beads, carvings, polished display stones, and lapidary collectibles; not generally used as a structural construction stone.

Geological facts

The circular “eye” patterns are orbicules created by rhythmic mineral precipitation or replacement. “Ocean jasper” is a popular trade name, and similar orbicular jaspers occur worldwide.

Field identification & locations

Identify by its opaque silica matrix, red iron staining, waxy polish, and repeated orbicular rings; distinguish it from agate, which is usually more translucent. Common sources include Madagascar, Mexico, Australia, and Oregon.