mineral

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, opaque red to orange-red, with a glassy to waxy luster and no visible cleavage; consists of cryptocrystalline quartz and chalcedony with hematite/goethite inclusions. The specimen appears tumbled and polished, with natural pale veining or fracture lines.

Identified September 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement volcanic ash, sediment, or cavities, incorporating iron minerals; deposits range from Precambrian to younger ages. Common sources include India, Madagascar, Brazil, Uruguay, and the western United States.

Uses & applications

Used as ornamental stone, cabochons, beads, carvings, polished stones, and decorative tile; valued primarily for color and pattern rather than rarity.

Geological facts

Jasper is a variety of chert distinguished by its opacity and abundant impurities. Red coloration generally reflects finely disseminated hematite or related iron oxides.

Field identification & locations

Identify it by its opaque red body, fine texture, lack of cleavage, and ability to scratch glass; it should not show large transparent quartz crystals. Common field material occurs in volcanic and sedimentary formations and river gravels.