mineral

Tumbled jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz (SiO₂), with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque reddish-brown to golden-brown, polished resinous-to-waxy luster, and conchoidal fracture hidden by tumbling. Quartz hardness is about 6.5–7 Mohs; specific gravity is approximately 2.55–2.70. The mottled pattern reflects iron oxides and possibly brecciation or orbicular textures.

Identified August 9, 2026More mineral →

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

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Jasper forms when silica-rich groundwater replaces or cements volcanic ash, sediment, or fractured rock, with iron producing the warm colors. It is commonly Paleozoic to Cenozoic in age, depending on its host deposit.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and ornamental objects; it has modest collectible value unless the pattern or locality is exceptional.

Geological facts

The specimen appears human-tumbled and wet or highly polished, which intensifies its color and gloss. Exact variety cannot be confirmed from a photograph alone; it could also be iron-rich chert or petrified wood.

Field identification & locations

Commonly found in volcanic and sedimentary terrains, including the Pacific Northwest near 48.4°N, 122.3°W. Field clues include opacity, fine-grained texture, no visible cleavage, and inability to scratch it with a steel knife easily; vinegar does not fizz.