sedimentary

Polished orbicular jasper

Orbicular jasper, an opaque microcrystalline quartz (SiO₂) aggregate with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; gray, cream, mustard-yellow, and brown orbicular patterns; dull to waxy/vitreous luster when polished; massive, cryptocrystalline structure with no cleavage; specific gravity roughly 2.5–2.7.

Identified August 30, 2026More sedimentary →

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At a glance

Common name: Polished orbicular jasper
Scientific name: Orbicular jasper, an opaque microcrystalline quartz (SiO₂) aggregate with iron-oxide and other mineral inclusions
Category: sedimentary
Identified: August 30, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 for a common polished palm stone; $30–$100+ for large, highly patterned or locality-specific 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 fluids cement volcanic or sedimentary material and mineral-rich centers develop concentric or radiating bands, commonly with limonite/goethite producing yellow-brown colors. Most specimens are Cenozoic to older, depending on locality.

Uses & applications

Used for cabochons, beads, carvings, polished display stones, and lapidary art; generally not used structurally.

Geological facts

The circular markings are orbicules or brecciated/infilled patterns, not biological fossils. Similar material may be sold as ocean jasper, rainforest jasper, or simply orbicular jasper, though trade names can overlap.

Field identification & locations

Identify by its opaque body, glassy polish, fine-grained texture, and rounded contrasting orbs; it should not show large visible quartz crystals. Common sources include Madagascar, Mexico, Australia, Oregon, and the western United States.