mineral

Tumbled jasper pebble (likely ocean jasper or brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque, mottled yellow-green, brown, gray, and reddish coloration; dull to waxy luster; cryptocrystalline quartz with no visible cleavage. The rounded shape indicates natural water wear or tumbling.

Identified August 16, 2026More mineral →

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At a glance

Common name: Tumbled jasper pebble (likely ocean jasper or brecciated jasper)
Scientific name: Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions
Category: mineral
Identified: August 16, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for a small tumbled pebble; distinctive patterning or confirmed locality may bring $10–$30.

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 rock fractures, with iron oxides producing the earthy colors. Formation ages vary widely, commonly from Paleozoic to Cenozoic deposits.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, and decorative objects; durable but generally not a high-value gemstone.

Geological facts

Jasper is a variety of opaque chalcedony and may contain hematite, goethite, clay, or volcanic fragments. Individual patterns are often diagnostic of a particular locality.

Field identification & locations

Identify by its opaque, fine-grained texture, hardness, waxy surface, and resistance to scratching by steel; quartz-rich material should scratch glass. Common sources include Madagascar, Oregon, India, Brazil, and Mexico.