mineral

Tumbled jasper (likely mookaite or brown/orange jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque, orange-brown and yellow, with a dull to waxy luster and a darker rind; quartz hardness is about 6.5–7 Mohs, with no visible cleavage and conchoidal fracture. The rounded shape indicates tumbling or natural abrasion.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediment, or other rock, while iron oxides create the warm colors. Precise locality and geological age cannot be determined from the photograph.

Uses & applications

Used for beads, cabochons, carvings, polished stones, and decorative objects; common pieces generally have modest collector value.

Geological facts

Jasper is an opaque variety of chalcedony rather than a single mineral species. Color zoning and iron staining are especially common in red, yellow, and brown varieties.

Field identification & locations

Field identification relies on opacity, fine-grained texture, waxy surface, lack of cleavage, and resistance to scratching; it should not scratch easily with a steel knife. Common sources include Australia, Madagascar, India, Brazil, and the western United States.