mineral

Polished ocean jasper / orbicular jasper (likely)

Microcrystalline quartz (chalcedony), commonly with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; dark blue-green to gray matrix with orange-red iron-oxide patches, opaque, waxy to dull luster, and no visible cleavage. The rounded shape and smooth surface indicate a polished or naturally water-worn specimen.

Identified August 19, 2026More mineral →

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At a glance

Common name: Polished ocean jasper / orbicular jasper (likely)
Scientific name: Microcrystalline quartz (chalcedony), commonly with iron-oxide and other mineral inclusions
Category: mineral
Identified: August 19, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small polished common piece; $30–$150+ for attractive, distinctive patterns or 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 fill cavities or replace volcanic rock, with iron oxides producing the red-orange areas; many ocean jasper varieties formed in Paleogene volcanic settings, especially Madagascar. Exact identification requires testing because similar material includes jasper, rhyolite, and slag.

Uses & applications

Used for cabochons, carvings, beads, polished stones, and mineral collections; not generally used structurally.

Geological facts

Jasper is an opaque variety of chalcedony, and its colors commonly result from hematite, goethite, chlorite, or other inclusions.

Field identification & locations

Check for a consistently fine-grained texture, glassy/waxy fracture, and hardness sufficient to scratch ordinary glass; natural jasper lacks bubbles and flow textures typical of slag. Common sources include Madagascar, Oregon, Mexico, and Australia.