sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Fracture: Conchoidal, Specific Gravity: 2.58-2.91

Hardness: 6

Identified July 19, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Fracture: Conchoidal, Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the infiltration of silica-rich fluids into sediment or volcanic ash, with high iron content providing the red pigment. Often found in hydrothermal veins and sedimentary deposits.

Uses & applications

Used primarily in lapidary work for jewelry, cabochons, and decorative carvings. Historically used for seals and amulets.

Geological facts

Red jasper was once known as the 'mother of all stones' in some ancient cultures and was frequently used for warriors' sword hilts and shields to provide protection and courage in battle.

Field identification & locations

Identify in the field by its deep red color, extreme hardness (it will scratch glass), and its smooth, shell-like (conchoidal) fracture pattern. Commonly found in South Africa, Brazil, and the USA.