sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 on Mohs scale; Color: Terracotta red to deep brick red; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Terracotta red to deep brick red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Terracotta red to deep brick red; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water-rich environments where iron oxide becomes trapped within the quartz lattice during crystallization. Often found in hydrothermal veins or as nodules in volcanic rocks.
Uses & applications
Used extensively in jewelry as beads and cabochons, lapidary carvings, ornamental objects, and historically for seal stones and amulets.
Geological facts
Red Jasper was known as the 'sun stone' in some ancient cultures and is mentioned in many historical texts for its supposed protective qualities. Its red color is derived specifically from high concentrations of hematite.
Field identification & locations
Identify in the field by its opaque red color, smoothness when water-worn, and hardness (it will scratch glass but not be scratched by a steel blade). Commonly found in riverbeds and coastal regions globally.
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