mineral

Polished Ocean Jasper or brecciated jasper

Jasper, microcrystalline quartz (SiO₂), colored by iron oxides and other impurities

AI-generated identification · may be incorrect

Opaque, highly polished, reddish-brown with a gray-green central area and subtle patterning; vitreous to waxy luster, no visible cleavage, conchoidal fracture, and Mohs hardness about 6.5–7. Specific gravity is typically 2.55–2.70.

Identified August 30, 2026More mineral →

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At a glance

Common name: Polished Ocean Jasper or brecciated jasper
Scientific name: Jasper, microcrystalline quartz (SiO₂), colored by iron oxides and other impurities
Category: mineral
Identified: August 30, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a palm-sized polished stone; $25–$75 if confirmed as attractive Madagascar ocean jasper with distinctive patterning.

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

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediment, or breccia; iron produces the red-brown coloration. Ocean jasper formed in volcanic environments, commonly in the Oligocene–Miocene (~34–5 million years ago), especially in Madagascar.

Uses & applications

Used for cabochons, tumbled stones, carvings, beads, and decorative objects; it is an attractive lapidary material rather than a major industrial stone. Small polished pieces have modest collector value.

Geological facts

The pictured stone may also be marketed simply as red-and-green jasper because exact locality identification is difficult from appearance alone. “Ocean jasper” is a trade name associated mainly with orbicular jasper from Madagascar.

Field identification & locations

Identify it by its opaque fine-grained texture, smooth polish, earthy red/green colors, and lack of individual crystals; it should not scratch easily with a steel knife. Common jasper occurs worldwide, while ocean jasper is chiefly from Madagascar.