mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7.0 (Mohs scale), Color: Red to brownish-red, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Cleavage: None, Specific gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: Red to brownish-red, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Cleavage: None, Specific gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica from hydrothermal solutions or in sedimentary environments. Its red color is derived from iron (hematite) inclusions within the silica matrix.
Uses & applications
Used in lapidary work, jewelry (beads, cabochons), ornamental carvings, and historically as gemstones and seals.
Geological facts
Red Jasper was known as the 'stone of endurance' in ancient cultures and has been used for thousands of years in jewelry and protective amulets. It is a variety of chalcedony.
Field identification & locations
Check for a conchoidal (shell-like) fracture and high hardness (cannot be scratched by a steel knife). Look for a dull to waxy luster and opaque red appearance. Found globally in deserts and riverbeds.
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