sedimentary
Red Jasper
Silicon dioxide with iron inclusions (SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica from hydrothermal solutions or volcanic ash in sedimentary environments, getting its red color from iron oxide (hematite) inclusions during the silica-rich fluid migration.
Uses & applications
Commonly used in jewelry (cabochons, beads), decorative carvings, lapidary arts, and historical seals or amulets. Also popular in the holistic 'healing crystal' market.
Geological facts
Red Jasper has been used since antiquity; it was known as the 'stone of endurance' in many cultures and was used in the Breastplate of the High Priest in biblical times.
Field identification & locations
Identified in the field by its opaque deep red color, high hardness (cannot be scratched by a steel knife), and smooth, waxy surface when tumbled. Found globally, notably in India, Brazil, USA (west), and South Africa.
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