mineral

Polished orbicular jasper (likely ocean jasper)

Jasper, microcrystalline quartz (SiO₂), colored by iron oxides and other inclusions

AI-generated identification · may be incorrect

Opaque, polished yellow-orange and dark green mottled material with a waxy-to-glassy luster; hardness about 6.5–7 Mohs, no visible cleavage, cryptocrystalline structure, and typical specific gravity near 2.6.

Identified August 12, 2026More mineral →

Explore Polished orbicular jasper (likely ocean 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

Forms when silica-rich fluids cement volcanic ash or replace volcanic rock, with iron producing the yellow-orange colors; orbicular varieties developed concentric or mottled growth patterns, commonly in Cenozoic volcanic settings.

Uses & applications

Used for cabochons, worry stones, carvings, and ornamental objects; unsuitable as a major construction stone because this specimen is small and decorative.

Geological facts

The pattern resembles ocean jasper, but exact identification requires locality or testing because several jaspers have similar colors and textures.

Field identification & locations

Field identification relies on opacity, very fine grain, conchoidal fracture, and inability to scratch with a steel knife easily; common sources include Madagascar, Mexico, Indonesia, and the western United States.