sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 on Mohs scale; Color: Red to brownish-red with dark streaks; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Red to brownish-red with dark streaks
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Red to brownish-red with dark streaks; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic or sedimentary environments. Most jasper is found in geological formations dating back to the Precambrian age, roughly 540 million to 4 billion years ago.
Uses & applications
Primary use in jewelry as cabochons, beads, and decorative carvings. Historically used for making stone tools and seals. Also popular for meditation and metaphysical collections.
Geological facts
The red color is caused by high concentrations of iron oxide. It has been mentioned in historical texts as one of the stones in the High Priest's Breastplate described in the Bible.
Field identification & locations
Identified by its opaque appearance (compared to translucent carnelian), deep red hue, and conchoidal fracture. Found worldwide, particularly in Brazil, India, USA, and South Africa.
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