sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)
Hardness: 6.5-7 Mohs; Color: Brick red to brownish red; Luster: Dull to Vitreous; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Brick red to brownish red
- Luster
- Dull to Vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brick red to brownish red; Luster: Dull to Vitreous; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.91
Formation & geological history
Formed from the deposition of silica-rich fluids in hydrothermal or sedimentary environments. The red color is derived from high iron content. It is typically found in Precambrian to more recent geological formations.
Uses & applications
Used primarily in lapidary work for jewelry, cabochons, and decorative ornaments. It was historically used for making tools and seals.
Geological facts
Red Jasper has been used since ancient times for talismans and was mentioned in the Bible as one of the stones in the breastplate of Aaron. It was known to early civilizations as a stone of endurance.
Field identification & locations
Identify in the field by its opaque brick-red color, smooth conchoidal fracture when broken, and inability to be scratched by a steel knife. Commonly found in riverbeds and mountainous regions globally.
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