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 6.5–7; opaque brick-red to brown with black or gray veining, vitreous to waxy luster, and no visible crystal faces or cleavage. The rounded, glossy surface indicates tumbling or polishing, with small natural pits or cavities.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement volcanic ash, sediments, or fractured rock; iron minerals create the red coloration. Jasper deposits formed in many settings and ages, commonly during Precambrian to younger volcanic and sedimentary activity.

Uses & applications

Used for cabochons, beads, carvings, worry stones, and decorative objects; lesser-grade material is ornamental aggregate. Common polished pieces generally have modest collector value.

Geological facts

Jasper is cryptocrystalline quartz, so individual quartz crystals are normally invisible without magnification. Red coloration commonly comes from hematite or other iron oxides, while dark bands may represent manganese minerals or host-rock fragments.

Field identification & locations

Identify it by its opaque red body color, hardness, fine grain, and resistance to scratching by a steel knife; it should not fizz in dilute acid. Common sources include India, Madagascar, Brazil, Uruguay, South Africa, and the western United States.