mineral

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide-rich inclusions

AI-generated identification · may be incorrect

Opaque, polished stone with dark brown to black groundmass and flowing golden-orange bands; typically Mohs 6.5–7, vitreous to waxy luster, cryptocrystalline structure, and no visible cleavage. The banding and color likely reflect iron oxides and silica-rich veins.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater replaces or cements volcanic ash, breccia, or other sediments, with iron oxidation producing the warm bands. Jasper deposits are geologically diverse and may range from Paleozoic to Cenozoic in age.

Uses & applications

Used for cabochons, beads, carvings, bookends, and decorative polished stones; generally ornamental rather than industrial.

Geological facts

Its appearance may resemble picture jasper, brecciated jasper, or iron-rich petrified material; exact identification requires examining texture and testing hardness.

Field identification & locations

Common in volcanic and hydrothermal regions worldwide, including Oregon, Idaho, Utah, Arizona, Madagascar, and Australia. A glassy streak-free surface, opacity, and ability to scratch ordinary glass support jasper identification.