sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep dark red; Luster: Dull to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to deep dark red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep dark red; Luster: Dull to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water solutions into fissures or cavities, often as a result of hydrothermal activity or sedimentary processes. Its deep red color comes from high iron (hematite) content.
Uses & applications
Used widely for lapidary work, jewelry (beads, cabochons), ornamental carvings, and as a popular specimen for collectors and healing crystal practitioners.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back to Arabic, Persian, Greek, and Latin. It is often referred to as a stone of endurance and nurturing in historical folklore.
Field identification & locations
Identify in the field by its opaque red color, smooth conchoidal fracture, and inability to be scratched by a steel knife. Commonly found in riverbeds or volcanic regions globally, notably in the USA, Brazil, and India.
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