mineral

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Hardness: 6.5-7.0 (Mohs scale); Color: Brick red to brownish red; Luster: Vitreous to dull; Crystal structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish red
Luster: Vitreous to dull

Identified March 3, 2026More mineral →

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Physical properties

Hardness: 6.5-7.0 (Mohs scale); Color: Brick red to brownish red; Luster: Vitreous to dull; Crystal structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica in hydrothermal veins or sedimentary environments where iron oxides (hematite) are present as impurities. It often forms during the late stages of volcanic activity or in iron-rich sedimentary basins.

Uses & applications

Used extensively as a gemstone in jewelry, for decorative carvings, as a polished pocket stone, and in lapidary work for cabochons and beads.

Geological facts

Red Jasper is known as a stone of endurance and was historically used in Egyptian amulets. It is an opaque variety of chalcedony that owes its vivid color to iron inclusions.

Field identification & locations

Identify by its deep red color, conchoidal fracture, and inability to be scratched by a steel knife. It is commonly found in India, Russia, Brazil, France, and the USA. Collectors should look for smooth, waxy surfaces in riverbeds or volcanic outcrops.

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