mineral

Tumbled jasper (likely ocean jasper or brecciated jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, reddish, black, and ochre coloration with earthy-to-waxy luster. Massive, non-cleaving, cryptocrystalline structure; rounded and polished by tumbling.

Identified September 11, 2026More mineral →

Explore Tumbled jasper (likely ocean jasper or brecciated jasper) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Tumbled jasper (likely ocean jasper or brecciated jasper)
Scientific name: Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions
Category: mineral
Identified: September 11, 2026
Method: Standard

AI Estimated Value

About $3–$20 for a tumbled piece of this size; $20–$100+ if it is confirmed collectible ocean jasper or from a notable locality.

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

Hardness about 6.5–7 Mohs; opaque brown, reddish, black, and ochre coloration with earthy-to-waxy luster. Massive, non-cleaving, cryptocrystalline structure; rounded and polished by tumbling.

Formation & geological history

Forms when silica-rich fluids replace or fill cavities in volcanic rocks, with iron and manganese oxides producing the dark and rusty patterns. Precise age and locality cannot be determined from the photograph; jasper commonly forms in volcanic terrains from Precambrian to younger rocks.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and decorative objects; also collected as an ornamental lapidary material.

Geological facts

Jasper is a variety of opaque chalcedony rather than a single mineral species. The mottled appearance may also indicate brecciated jasper or iron-rich rhyolite.

Field identification & locations

Identify it by its opacity, curved conchoidal fracture, high polish, and resistance to scratching by a steel blade; it should not fizz in dilute acid. Common sources include Madagascar, Oregon, Utah, Brazil, and Australia.