sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull or waxy when raw, vitreous when polished; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91.

Hardness: 6
Color: Brick red to brownish-red
Luster: Dull or waxy when raw, vitreous when polished

Identified March 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica from volcanic ash or hydrothermal fluids in sedimentary environments. Its red color is derived from high iron content (hematite inclusions) that oxidized during formation millions of years ago.

Uses & applications

Extensively used for lapidary work including cabochons, beads, and sculpture. Historically used for seals and amulets. Also used as a decorative stone in mosaics and as a healing stone in metaphysical communities.

Geological facts

Ancient Egyptians associated Red Jasper with the 'Blood of Isis' and used it in protective amulets. It is an opaque variety of chalcedony that never transmits light, even at thin edges.

Field identification & locations

Identify in the field by its opaque red color and smooth, shell-like (conchoidal) fracture pattern. It can be found globally with major deposits in India, Brazil, South Africa, and the USA (Southwest). Collectors should look for patterns with different colored mineral 'veins'.

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