mineral

Tumbled brecciated jasper (likely ocean jasper or red-and-gray jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide hematite/goethite and dark volcanic-mineral inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque, multicolored red, gray, cream, and black; polished vitreous to waxy luster; cryptocrystalline quartz with no visible cleavage and conchoidal fracture. The rounded shape indicates tumbling or natural water abrasion.

Identified September 2, 2026More mineral →

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At a glance

Common name: Tumbled brecciated jasper (likely ocean jasper or red-and-gray jasper)
Scientific name: Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide hematite/goethite and dark volcanic-mineral inclusions
Category: mineral
Identified: September 2, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 as a small tumbled stone; $20–$75 if confirmed as attractive ocean jasper or a rare locality specimen.

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 cement or replace volcanic and sedimentary material, with iron oxides producing red coloration; some ocean jasper formed in Miocene volcanic settings near Madagascar. Exact age and locality cannot be confirmed from the photograph.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and decorative objects; common tumbled pieces generally have modest collector value.

Geological facts

The specimen appears brecciated, meaning angular fragments were later cemented by silica. Red coloration commonly reflects hematite, while gray-black areas may represent altered volcanic rock or manganese-rich material.

Field identification & locations

Identify by its opaque patterned body, very high hardness, lack of cleavage, and inability to scratch with a steel knife; quartz-rich jasper commonly scratches glass. Common sources include Madagascar, Brazil, India, Mexico, and the western United States.