sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 Mohs; Color: Brick red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brick red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the accumulation of silica in sedimentary environments or through hydrothermal fluids filling cracks in volcanic rocks. Its red color comes from high concentrations of iron oxide (hematite).
Uses & applications
Used extensively in jewelry as cabochons, beads, and carvings. Historically used for making tools due to its conchoidal fracture. Also popular in metaphysical collections.
Geological facts
Red Jasper was known as the 'rain bringer' in some ancient cultures. It is a variety of chalcedony that is opaque, unlike translucent agates.
Field identification & locations
Identify by its deep red color and smooth, shell-like (conchoidal) fracture surfaces. It cannot be scratched by a steel knife. Common in diverse locations like the USA (southwest), Brazil, and India.
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