sedimentary
Red Jasper
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Vitreous to waxy; Crystal structure: Hexagonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Vitreous to waxy; Crystal structure: Hexagonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic or sedimentary environments. The red color comes from high concentrations of iron oxide (hematite) during its formation. It is often associated with ancient banded iron formations.
Uses & applications
Commonly used in jewelry (beads, cabochons), lapidary arts, ornamental carving, and as a metaphysical healing stone. Historically used for making tools and seals.
Geological facts
Jasper is an opaque variety of chalcedony. In ancient times, it was considered a 'rain bringer' and was mentioned in many historical texts for its grounding properties. It is often found as smooth pebbles in riverbeds.
Field identification & locations
Identify by its deep red color, total opacity (even when held to light), and conchoidal fracture. It will easily scratch glass but cannot be scratched by a steel knife. Common in South Africa, Brazil, and the USA.
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