mineral

Polished/tumbled brecciated jasper (likely rainforest or ocean jasper)

Microcrystalline quartz (SiO₂), commonly mixed with chalcedony, iron oxides, and other silicates

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque, multicolored brown, red, gray, cream, and green patches; waxy to vitreous luster; cryptocrystalline quartz with no visible cleavage and conchoidal fracture. The wet or polished surface intensifies its colors.

Identified August 23, 2026More mineral →

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At a glance

Common name: Polished/tumbled brecciated jasper (likely rainforest or ocean jasper)
Scientific name: Microcrystalline quartz (SiO₂), commonly mixed with chalcedony, iron oxides, and other silicates
Category: mineral
Identified: August 23, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common polished hand specimen; $30–$150+ for unusually attractive, verified ocean jasper.

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 or sedimentary material, often producing brecciation and iron-oxide staining. The exact geological age and locality cannot be determined from the photograph; ocean jasper is chiefly associated with Miocene volcanic rocks of Madagascar.

Uses & applications

Used for cabochons, beads, carvings, polished display stones, and lapidary art; occasionally sold as decorative aggregate. It is generally a collectible ornamental material rather than a construction stone.

Geological facts

Jasper is a variety of opaque chalcedony, and its patterns commonly result from brecciation, mineral replacement, and iron staining. “Ocean jasper” is a trade name applied to orbicular or patterned jasper, not a single formally defined mineral species.

Field identification & locations

Identify it by its opaque silica-rich body, hardness, lack of cleavage, and red-brown iron staining; it should resist scratching by a steel blade. Common jasper occurs worldwide, while confirmed ocean jasper localities are concentrated in Madagascar; exact identification requires locality or testing.