sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Deep Brick Red to Brownish Red; Luster: Vitreous to Waxy (tumbled); Crystal Structure: Hexagonal (trigonal microcrystalline); Cleavage: None (conchoidal fracture); Opaque.

Hardness: 6
Color: Deep Brick Red to Brownish Red
Luster: Vitreous to Waxy (tumbled)

Identified July 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into sediment or volcanic ash, with high iron content giving its signature red color. Often found in hydrothermal veins or as a secondary mineral in sedimentary deposits.

Uses & applications

Used widely in lapidary arts for cabochons, beads, and tumbled stones. Historically used for seals and amulets. Modern industry uses it as an abrasive and in architectural decoration.

Geological facts

Ancient Egyptians associated Red Jasper with the blood of Isis and used it for amulets. It is unique among jaspers for its high concentration of hematite inclusions.

Field identification & locations

Identify in the field by its deep red color, opacity (light does not pass through edges), and extreme hardness (cannot be scratched by a steel knife). Commonly found in riverbeds and mountainous regions in India, Brazil, and the USA.