sedimentary

Red Jasper

Silicon Dioxide with Iron Oxide impurities (SiO2)

AI-generated identification · may be incorrect

Hardness 6.5-7 on the Mohs scale, opaque brick-red to deep brownish-red color with distinct banding or quartz veining, vitreous to dull/waxy luster, microcrystalline trigonal structure, no cleavage, specific gravity of approximately 2.58-2.91.

Identified July 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed primarily through the deposition of silica-rich fluids in sedimentary or hydrothermal environments. Iron oxide inclusions (hematite) give it its signature red pigmentation. It often forms in volcanic ash beds or banded iron formations.

Uses & applications

Used extensively in jewelry making, lapidary arts, cabochons, polished tumbled stones, decorative carvings, and as a popular collectible specimen.

Geological facts

Red Jasper was historically known as the 'stone of endurance' and was used by ancient civilizations, including the Egyptians and Native Americans, for protective amulets and carved seals.

Field identification & locations

Identified by its smooth texture when polished, high hardness (will scratch glass), opaque red color, and characteristic quartz/calcite veins. Commonly found in South Africa, Madagascar, Brazil, India, and the western United States.