mineral

Polished red jasper

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brick-red to orange-red, vitreous to waxy luster, very fine-grained cryptocrystalline structure, and no visible cleavage. The smooth rounded surface indicates tumbling and polishing.

Identified September 10, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic or sedimentary material, with hematite/goethite producing the red color. Deposits occur in many ages, commonly Precambrian to younger volcanic and sedimentary terrains.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and lapidary collectibles; occasionally used as decorative stone. It is not generally used for structural construction.

Geological facts

Its dense texture and iron-oxide staining distinguish it from porous red sandstone. Fine dark speckling and subtle patterns are common in varieties marketed as red jasper.

Field identification & locations

Identify by its opaque red color, high polish, glassy-to-waxy surface, and ability to scratch ordinary glass; a streak or hardness test can confirm it. Common sources include India, Brazil, Madagascar, the United States, and Australia.