mineral

Tumbled jasper (likely ocean or orbicular jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and dark accessory minerals

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque, waxy to glassy luster, tan/yellow-brown matrix with red-brown, black, blue-green, and rounded orbicular inclusions. It has no visible cleavage and is likely naturally water-worn or polished.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids fill cavities or replace volcanic rock, incorporating iron oxides and other minerals; commonly Cenozoic to older volcanic-hosted material. The rounded shape may result from stream abrasion or tumbling.

Uses & applications

Used for cabochons, beads, carvings, display pieces, and lapidary crafts; generally unsuitable as a major construction stone because of its small size.

Geological facts

Orbicular patterns can resemble eyes or flower-like spherulites, though this specimen’s inclusions may also be iron-rich fragments or breccia clasts. Identification is best confirmed by a hardness test and examination of a fresh surface.

Field identification & locations

Commonly found in volcanic terrains and gravel beds, especially in Oregon, Madagascar, Mexico, Australia, and Indonesia. Look for opaque chalcedony, conchoidal fracture, dense weight, and resistance to scratching by a steel blade.