mineral

Polished red-and-cream jasper

Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides

AI-generated identification · may be incorrect

Opaque, cream to brick-red, with a dull-to-waxy polish and mottled brecciated pattern; Mohs hardness about 6.5–7, no visible cleavage, conchoidal fracture, and specific gravity near 2.6. The specimen appears tumbled or naturally water-worn and may include iron-rich inclusions or breccia fragments.

Identified September 21, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater replaces or cements fine sediments, volcanic ash, or brecciated rock, with hematite/goethite producing the red coloration. Deposits formed in many ages, commonly in volcanic or hydrothermal environments.

Uses & applications

Used for cabochons, beads, carvings, bookends, and decorative stone; attractive polished pieces are collected as lapidary material.

Geological facts

Jasper is technically an opaque variety of chalcedony or microcrystalline quartz, though trade usage includes several silica-rich rocks. Red color generally indicates oxidized iron minerals.

Field identification & locations

Identify it by its opacity, red iron staining, hardness, and inability to scratch with a steel knife; quartz or glass can scratch it. Common sources include India, Madagascar, Brazil, Australia, and the western United States.