mineral

Polished banded jasper (likely ocean jasper or brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron oxides and assorted silicate inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, black, cream, and reddish-orange coloring with rounded orbicular spots and irregular pale bands; vitreous to waxy luster, cryptocrystalline structure, no visible cleavage, and specific gravity about 2.6.

Identified September 2, 2026More mineral →

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At a glance

Common name: Polished banded jasper (likely ocean jasper or brecciated jasper)
Scientific name: Microcrystalline quartz/chalcedony, SiO₂, with iron oxides and assorted silicate inclusions
Category: mineral
Identified: September 2, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a palm-sized polished specimen; unusually vivid, well-patterned pieces may sell for $40–$100.

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 and sedimentary material, with iron producing the brown-red colors; orbicular varieties formed through localized rhythmic mineral growth. The exact geological age and locality cannot be determined from the photograph.

Uses & applications

Used as a tumbled stone, cabochon, carving material, and decorative object; durable but generally less valuable than high-grade agate or precious gemstones.

Geological facts

The surface appears polished, emphasizing orbicular or brecciated patterning. “Ocean jasper” is a trade name commonly applied to orbicular jasper, especially material from Madagascar.

Field identification & locations

Identify it by its opaque patterned chalcedony, hardness, waxy-to-glassy luster, and lack of cleavage; it should not scratch easily with a steel blade. Common jasper occurs worldwide, including Madagascar, India, Brazil, Mexico, and the western United States.