sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 on Mohs scale; Color: Dull red to brick red; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Dull red to brick red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Dull red to brick red; Luster: Vitreous to waxy; 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 volcanic ash, with its red color derived from iron (hematite) inclusions. It is often found in sedimentary or metamorphic layers.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular pocket stone for collectors. Historically used for making tools and seals.
Geological facts
Red Jasper has been used since antiquity as a sacred stone. It was known as the 'blood of Mother Earth' in some cultures and was used in the breastplate of the High Priest in Biblical times.
Field identification & locations
Identify by its opaque red color and high hardness (cannot be scratched by a steel knife). Commonly found in India, Brazil, Madagascar, and the USA (southwestern states).
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