sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Deep red to brownish-red; Luster: Vitreous to dull; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep red to brownish-red; Luster: Vitreous to dull; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of fine-grained silica in hydrothermal veins or as sedimentary deposits. Its red color comes from high concentrations of iron oxide (hematite) during its formation process, typically found in ancient volcanic and sedimentary environments.
Uses & applications
Used primarily in lapidary arts, jewelry (beads, cabochons), ornamental carvings, and as a decorative stone in landscaping. Historically used for seals and amulets.
Geological facts
The name comes from the Greek word 'iaspis', meaning spotted stone. It was once known as the 'mountain-man' stone because it was believed to provide protection during travels in the wild. Some cultures associated it with the blood of Mother Earth.
Field identification & locations
Identify in the field by its opaque nature (unlike agate which is translucent), its smooth conchoidal fracture (breaks like glass), and its inability to be scratched by a steel knife. Common in the USA, Brazil, India, and Australia.
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