mineral

Tumbled jasper (likely red/brown jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

AI-generated identification · may be incorrect

Opaque reddish-brown to tan, waxy-to-dull luster, fine-grained with irregular pale quartz/chalcedony patches; no visible cleavage, conchoidal fracture; Mohs hardness about 6.5–7; specific gravity roughly 2.55–2.70.

Identified September 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces volcanic and sedimentary rocks, with iron oxidation producing the warm colors. Most jasper is Precambrian to Cenozoic in age, depending on locality; this specimen has been polished or naturally rounded.

Uses & applications

Used as an ornamental stone, cabochon, bead, carving material, and lapidary/tumbling rough; occasionally used for decorative tiles and small objects.

Geological facts

Jasper is an opaque variety of chalcedony rather than a single mineral species. Patterns and color depend mainly on iron oxides, clay, and included rock fragments.

Field identification & locations

Identify by its opacity, earthy red-brown color, very fine texture, hardness, and lack of cleavage; it should resist scratching by a steel knife. Common sources include India, Madagascar, Brazil, the western United States, and Australia.