mineral

Tumbled ocean jasper (orbicular/chalcedony-rich jasper)

Silicified microcrystalline quartz, chiefly SiO₂, with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque to translucent gray-white body with red, orange, brown, and dark inclusions, a waxy to glassy luster, and no visible cleavage. The rounded shape indicates mechanical tumbling and polishing.

Identified August 30, 2026More mineral →

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At a glance

Common name: Tumbled ocean jasper (orbicular/chalcedony-rich jasper)
Scientific name: Silicified microcrystalline quartz, chiefly SiO₂, with iron-oxide and other mineral inclusions
Category: mineral
Identified: August 30, 2026
Method: Standard

AI Estimated Value

About $3–$15 for a small tumbled stone; $20–$100+ for unusually colorful, strongly patterned polished 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 replace or fill cavities in volcanic rocks, commonly producing orbicular patterns through successive mineral deposition; Madagascar is the classic source. Its exact geological age depends on locality, often Mesozoic to Cenozoic volcanic host rocks.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and lapidary collections; attractive patterned pieces may have modest jewelry value.

Geological facts

The red and orange colors typically come from hematite or other iron oxides, while white and gray areas are chalcedony, quartz, or altered volcanic material.

Field identification & locations

Identify it by its fine-grained silica texture, high hardness, opaque orbicular patches, and lack of cleavage; it should scratch glass but resist a steel knife. Common sources include Madagascar, Oregon, Indonesia, and Mexico.