rock

Polished orbicular jasper

Silicified volcanic breccia or rhyolitic jasper; primarily microcrystalline quartz (SiO₂) with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, opaque, orange-yellow with black, gray, and cream orbicular or brecciated patterns; waxy to vitreous luster when polished. Massive, noncleavable, and commonly has specific gravity around 2.5–2.7.

Identified August 16, 2026More rock →

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At a glance

Common name: Polished orbicular jasper
Scientific name: Silicified volcanic breccia or rhyolitic jasper; primarily microcrystalline quartz (SiO₂) with iron-oxide and other mineral inclusions
Category: rock
Identified: August 16, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a common polished stone; $30–$150+ for unusually attractive patterns, larger pieces, or verified locality 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 volcanic fluids replace or cement volcanic ash, breccia, or spherulitic rhyolite; iron oxides create the orange coloration. Most examples are Cenozoic to older volcanic rocks, with exact age depending on locality.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and lapidary collectibles; rarely used in construction because of its decorative value and small occurrence size.

Geological facts

The rounded shape and glossy surface indicate tumbling or polishing rather than natural weathering. Similar material is sold as ocean jasper, leopard jasper, or rainforest jasper, though trade names are not always scientifically precise.

Field identification & locations

Identify it by its fine-grained opaque quartz texture, hardness, and contrasting iron-rich patterns; it should resist scratching by a steel knife. Common sources include Madagascar, Mexico, Australia, and the western United States.