sedimentary
Red Jasper
Silicon Dioxide (SiO2) - Opaque Chalcedony
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep terracotta; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to deep terracotta
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep terracotta; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of silica-rich sediments or volcanic ash that undergo lithification and intense pressure. The red color is derived from iron (hematite) inclusions during hydrothermal processes.
Uses & applications
Used widely in lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a decorative stone in landscaping. Historically used for seals and amulets.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back to Greek, Hebrew, and Persian languages. It is often called the 'supreme nurturer' in metaphysical circles.
Field identification & locations
Identify by its opaque nature, smooth conchoidal fracture, and inability to be scratched by a steel knife. Commonly found in riverbeds or as eroded nodules in desert regions.
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