mineral

Polished orbicular jasper (likely ocean jasper or rhyolitic jasper)

Microcrystalline quartz (SiO₂) with iron-oxide and altered volcanic inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque mustard-brown with muted orange/green mottling, vitreous-to-waxy luster, and no visible cleavage. The smooth tumbled surface suggests a silica-rich jasper rather than glass or plastic.

Identified September 9, 2026More mineral →

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At a glance

Common name: Polished orbicular jasper (likely ocean jasper or rhyolitic jasper)
Scientific name: Microcrystalline quartz (SiO₂) with iron-oxide and altered volcanic inclusions
Category: mineral
Identified: September 9, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small tumbled piece; $20–$100+ for attractive patterned cabochons 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 fluids replace or cement volcanic ash and flow rock, with iron oxides producing the brown-orange colors; many ocean-jasper materials formed in Oligocene–Miocene volcanic rocks of Madagascar. Exact locality cannot be confirmed from the image.

Uses & applications

Used for cabochons, carvings, beads, polished stones, and decorative objects; usually inexpensive as a small tumbled specimen.

Geological facts

Jasper is an impure, opaque variety of chalcedony and quartz. Orbicular patterns, when present, arise from concentric mineral growth or alteration around volcanic centers.

Field identification & locations

Identify by its natural mottling, opaque body, glassy/waxy polish, and inability to scratch with a fingernail or steel knife; a streak, hardness, and specific-gravity test would improve identification. Common sources include Madagascar, Mexico, Oregon, and Australia.