mineral

Polished ocean jasper (orbicular jasper), possibly rainforest jasper

Microcrystalline quartz/chalcedony (SiO₂) with iron-rich and other mineral inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; blue-gray, cream, yellow, and brown orbicular pattern; vitreous to waxy luster; opaque to slightly translucent; no visible cleavage, conchoidal fracture, and very fine-grained cryptocrystalline structure.

Identified August 15, 2026More mineral →

Explore Polished ocean jasper (orbicular jasper), possibly rainforest jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Polished ocean jasper (orbicular jasper), possibly rainforest jasper
Scientific name: Microcrystalline quartz/chalcedony (SiO₂) with iron-rich and other mineral inclusions
Category: mineral
Identified: August 15, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 for a small common polished piece; $30–$100+ for vivid, well-patterned or locality-documented material.

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 fluids replace or fill cavities in volcanic rock, while iron oxides and other minerals create the rounded patterns. Most ocean jasper comes from Miocene-age volcanic rocks near Madagascar, though visually similar jaspers occur elsewhere.

Uses & applications

Used for cabochons, beads, carvings, decorative objects, and polished collectibles; not generally used as a major construction stone.

Geological facts

Orbicular patterns are produced by concentric mineral growth or replacement, not fossils. The blue coloration may reflect chlorite, amphibole, or other inclusions; exact identification requires testing or provenance.

Field identification & locations

Identify by its opaque polished surface, multicolored rounded patches, quartz-like hardness, and lack of cleavage; it should resist scratching from a steel knife. Common sources include Madagascar, Mexico, Indonesia, and Australia.