mineral

Red jasper

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

AI-generated identification · may be incorrect

Typically brick-red to reddish-brown, opaque, with a glassy to waxy luster; Mohs hardness 6.5–7, no visible cleavage, and cryptocrystalline quartz structure. The smoothly rounded, glossy surface indicates a tumbled or polished specimen.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement fine sediment or replace volcanic and other rocks, with iron minerals producing the red color. Deposits range from Precambrian to younger ages and occur worldwide.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and lapidary specimens; occasionally used as decorative stone. It has little industrial value compared with quartzite or building stone.

Geological facts

Jasper is a variety of chalcedony/quartz distinguished by its opacity and abundant impurities. Red color commonly reflects hematite or goethite inclusions.

Field identification & locations

Identify it by its opaque red body, fine texture, lack of visible grains, and ability to scratch ordinary glass; it should not fizz in dilute acid. Common sources include India, Brazil, Madagascar, Australia, and the western United States.