sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs), Color: Red to brownish-red, Luster: Dull to vitreous, Crystal structure: Hexagonal (Microcrystalline), Cleavage: None (Conchoidal fracture)
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Red to brownish-red, Luster: Dull to vitreous, Crystal structure: Hexagonal (Microcrystalline), Cleavage: None (Conchoidal fracture)
Formation & geological history
Formed primarily in sedimentary environments when silica-rich fluids permeate through volcanic ash or other sediments; the red color is caused by the inclusion of iron oxide during formation.
Uses & applications
Commonly used as a gemstone, in jewelry (beads, cabochons), for decorative carvings, and as a component in lapidary arts.
Geological facts
Red Jasper was known as the 'stone of endurance' in ancient cultures and was frequently used by Viking and Germanic warriors to inlay the hilts of their swords for protection.
Field identification & locations
Identified in the field by its opaque reddish appearance and smooth, waxy feel when wet. It is very hard and cannot be scratched by a steel knife. Common in diverse locations including Brazil, USA, and Madagascar.
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