sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs scale), Color: Brick red to deep brownish-red, Luster: Vitreous to dull, Crystal Structure: Hexagonal (Trigonal) microcrystalline, Cleavage: None, Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to deep brownish-red, Luster: Vitreous to dull, Crystal Structure: Hexagonal (Trigonal) microcrystalline, Cleavage: None, Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica from hydrothermal solutions or volcanic ash into sedimentary environments, often containing iron oxide (hematite) which provides the red pigment. It can also form during the silicification of organic material.
Uses & applications
Commonly used as a gemstone for jewelry (cabochons), lapidary carvings, decorative ornamental stones, and in historical contexts for seals and amulets.
Geological facts
Red Jasper was known as the 'stone of endurance' in ancient times and has been found in archaeological sites dating back to the Bronze Age. It is a variety of chalcedony that is opaque throughout.
Field identification & locations
Identify in the field by its opaque deep red color, conchoidal fracture, and inability to be scratched by a steel knife. Frequently found in riverbeds, or areas with volcanic activity such as India, Brazil, and the Southwestern United States.
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