mineral

Polished/tumbled jasper, likely ocean jasper or brecciated jasper

Jasper: microcrystalline quartz (SiO₂) with iron oxides and other silicate impurities

AI-generated identification · may be incorrect

Typically opaque, waxy to glassy luster; red-brown, mustard-yellow, green, and black patterns from iron minerals and altered silicates. Hardness ~6.5–7 Mohs, massive cryptocrystalline structure, no visible cleavage, specific gravity ~2.5–2.9; the glossy surface indicates polishing or natural water-wearing.

Identified August 10, 2026More mineral →

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At a glance

Common name: Polished/tumbled jasper, likely ocean jasper or brecciated jasper
Scientific name: Jasper: microcrystalline quartz (SiO₂) with iron oxides and other silicate impurities
Category: mineral
Identified: August 10, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small polished stone; $30–$150+ for unusually attractive patterned material or quality cabochons.

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 groundwater replaces or fills cavities in volcanic rocks, incorporating iron-rich material; many specimens formed in Cenozoic volcanic environments, though jasper occurs across geologic ages. The exact variety cannot be confirmed from the photograph alone.

Uses & applications

Used for beads, cabochons, carvings, worry stones, and decorative objects; crushed jasper has minor aggregate and ornamental uses.

Geological facts

The contrasting colors commonly reflect hematite/goethite (red-yellow) and chlorite or other green minerals. “Ocean jasper” is a trade name generally associated with orbicular jasper from Madagascar, not a formal mineral species.

Field identification & locations

Identify by its opacity, fine-grained texture, strong polish, and resistance to scratching; unlike glass, it usually lacks bubbles and has natural irregular color patterns. Common sources include Madagascar, India, Brazil, Australia, and the United States.