mineral

Polished red jasper

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

AI-generated identification · may be incorrect

Typically opaque brick-red to reddish-brown, with vitreous-to-waxy luster and occasional pale quartz or hematite veining; Mohs hardness 6.5–7, no visible cleavage, cryptocrystalline structure, and specific gravity about 2.55–2.70.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace fine-grained sediments or volcanic material, with iron oxides producing the red color; deposits range from Precambrian to younger ages. This specimen is shaped and polished.

Uses & applications

Used for cabochons, beads, carvings, worry stones, tumbled stones, and ornamental objects; it has little industrial value compared with ordinary quartz.

Geological facts

Jasper is a variety of chert distinguished by its opacity and abundant impurities. The pale streaks may represent quartz-rich veins or brecciation rather than banding.

Field identification & locations

Identify it by its opaque red body, glassy polish, hardness sufficient to scratch glass, and lack of fizz in dilute acid; common sources include India, Madagascar, Brazil, Australia, and the United States.