mineral

Red jasper

Microcrystalline quartz (SiO₂), colored mainly by iron oxides

AI-generated identification · may be incorrect

Typically opaque brick-red to reddish-brown with a dull to glassy luster; hardness about 6.5–7 Mohs, no visible cleavage, cryptocrystalline structure, and specific gravity around 2.6.

Identified September 7, 2026More mineral →

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Physical properties

Typically opaque brick-red to reddish-brown with a dull to glassy luster; hardness about 6.5–7 Mohs, no visible cleavage, cryptocrystalline structure, and specific gravity around 2.6.

Formation & geological history

Forms when silica-rich fluids deposit and cement fine-grained sediment or volcanic material, with iron staining producing the red color; specimens commonly formed in Precambrian to younger environments.

Uses & applications

Used for cabochons, beads, carvings, bookends, and ornamental stone; small rough pieces are common lapidary material.

Geological facts

Jasper is a variety of chalcedony/quartz distinguished by its opacity and abundant impurities; patterns and colors can vary widely within one deposit.

Field identification & locations

Identify it by its opaque red color, very fine texture, lack of cleavage, and ability to scratch glass; common sources include India, Brazil, Madagascar, Australia, and the western United States.