mineral

Red jasper

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

AI-generated identification · may be incorrect

Typically opaque brick-red to orange-brown, with earthy to slightly waxy luster and irregular conchoidal fractures; Mohs hardness about 6.5–7, no cleavage, cryptocrystalline quartz structure. The pictured specimen appears rough and naturally fractured, with possible iron-rich matrix or brecciation.

Identified September 6, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement volcanic, sedimentary, or hydrothermal rocks, with iron oxides producing the red color; deposits range from Precambrian to younger ages. Common worldwide, especially in volcanic and hydrothermal terrains.

Uses & applications

Used for beads, cabochons, carvings, countertops, and decorative stone; attractive polished pieces are popular with collectors. It is generally too opaque for faceted gemstone use.

Geological facts

Jasper is technically a rock rather than a single mineral, although quartz is its dominant component. Color and patterns vary greatly, and names such as picture jasper or brecciated jasper describe visual varieties.

Field identification & locations

Identify it by its dense opaque red color, hardness, lack of visible cleavage, and inability to scratch it with a steel knife easily; a glassy streak or conchoidal fracture supports quartz content. Common sources include India, Madagascar, Brazil, the United States, and Australia.