sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to waxy, 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 waxy, 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 water solutions into fissures or cavities in other rocks. Its red color is derived from high concentrations of iron oxide (hematite) during the lithification process.
Uses & applications
Commonly used for lapidary work, jewelry (beads, cabochons), architectural decoration, and as a spiritual or healing stone in alternative medicine.
Geological facts
Red Jasper was known as the 'rain bringer' in some indigenous cultures. It is an opaque variety of chalcedony that has been used for seals and amulets since ancient Egyptian and Minoan civilizations.
Field identification & locations
Identify in the field by its intense red color, opacity (light will not pass through even thin edges), and its ability to scratch glass. It is commonly found in India, Brazil, Madagascar, and the Southwestern United States.
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