mineral

Polished jasper

Microcrystalline quartz (chalcedony), chiefly SiO₂, with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Typically opaque, reddish-brown, tan, and cream with brecciated or flow-like patterns; vitreous to waxy luster and no visible cleavage. Mohs hardness 6.5–7; specific gravity about 2.55–2.70; the pictured piece is polished and likely tumbled or cabochon-shaped.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich groundwater or volcanic fluids replace and cement sediments, volcanic ash, or breccia, with iron oxides producing red and brown colors. It forms in many ages and settings, commonly within volcanic or sedimentary rocks.

Uses & applications

Used for cabochons, carvings, beads, worry stones, ornamental objects, and lapidary collections; rarely used as a minor decorative stone in architecture.

Geological facts

The color and pattern suggest a brecciated or iron-rich jasper variety, but a precise trade name cannot be confirmed from an image alone.

Field identification & locations

Identify it by its opacity, earthy red-brown patterning, glassy polish, and resistance to scratching; it should not be scratched by a steel knife easily. Common sources include India, Madagascar, Brazil, Australia, Mexico, and the western United States.