mineral

Polished ocean jasper (orbicular jasper), possibly brecciated jasper

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

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, opaque to translucent, with a waxy to glassy luster; this specimen shows cream chalcedony, reddish iron-oxide staining, and irregular brecciation rather than clear crystal faces. Specific gravity is usually about 2.58–2.65.

Identified September 21, 2026More mineral →

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At a glance

Common name: Polished ocean jasper (orbicular jasper), possibly brecciated jasper
Scientific name: Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions
Category: mineral
Identified: September 21, 2026
Method: Standard

AI Estimated Value

Approximately $10–$50 for a palm-sized polished common piece; rare, vividly orbicular Madagascar material may sell for $100–$500+.

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 rock, incorporating iron oxides and other minerals; much ocean jasper formed in Paleoproterozoic volcanic environments roughly 1.5–2 billion years ago. The pictured piece appears naturally rounded and polished.

Uses & applications

Used for cabochons, carvings, beads, ornamental slabs, and lapidary collections; it has little construction value.

Geological facts

“Ocean jasper” is a trade name, not a single mineral species; true material historically associated with coastal Madagascar is prized for orbicular patterns and vivid colors.

Field identification & locations

Identify by its hardness, fine-grained silica texture, opaque cream-to-red patterning, and inability to show cleavage; a steel file generally scratches it only with difficulty. Common sources include Madagascar, Australia, Brazil, and the western United States.