sedimentary

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2 with Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on the Mohs scale; Color: Brick red to brownish-red with occasional darker or lighter veining; Luster: Vitreous to waxy, slightly dull on raw or water-worn surfaces; Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz aggregate); Cleavage: None (conchoidal fracture);…

Hardness: 6

Identified November 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich waters in sedimentary or volcanic environments, often infiltrating volcanic ash or sediment voids where iron oxide (hematite) particles impregnate the microcrystalline quartz matrix, imparting its rich red color.

Uses & applications

Widely used as an ornamental stone, lapidary material for tumbling, cabochons, carvings, and bead making in jewelry. Also popular as a metaphysical and collector gemstone.

Geological facts

Red jasper was used by ancient civilizations, including the Egyptians and Greeks, for amulets, seals, and carvings. In medieval times, it was believed to staunch bleeding and grant warriors physical strength and protection.

Field identification & locations

Recognizable in the field by its opaque brick-red color, smooth water-worn or conchoidal fracture surfaces, and high hardness (scratches glass, cannot be scratched by a steel nail). Commonly found along river gravels, desert washes, and coastal pebble beaches worldwide.