mineral

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), commonly with iron-oxide impurities

AI-generated identification · may be incorrect

Opaque brown, reddish, and tan stone with polished vitreous-to-waxy luster and mottled/brecciated pattern; quartz hardness is about 6.5–7 Mohs, with no visible cleavage and conchoidal fracture. The blue-purple flashes may be surface reflections or minor iridescent inclusions/coating.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater replaces or cements sediments, volcanic ash, or fragmented rock, with iron oxides creating the earthy colors. Jasper deposits formed in many geological periods, commonly from Precambrian through younger volcanic and sedimentary environments.

Uses & applications

Used for cabochons, beads, carvings, polished specimens, and decorative objects; it has little industrial value compared with ordinary quartz.

Geological facts

Jasper is a variety of chert distinguished mainly by its opacity and abundant impurities. “Brecciated jasper” refers to angular fragments cemented by silica and/or iron-rich material.

Field identification & locations

Identify it by its opaque appearance, fine texture, hardness, and inability to scratch with a steel knife easily; it should not show distinct large crystals. Common sources include the western United States, Madagascar, Brazil, India, and Australia.