sedimentary
Raw Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
Hardness: 6.5-7 (Mohs); Color: deep mossy green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9
- Hardness
- 6
- Color
- deep mossy green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: deep mossy green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9
Formation & geological history
Formed through the infiltration of silica-rich fluids into fissures or volcanic ash deposits, common in metamorphic belts or sedimentary basins across various geological ages from the Precambrian to recent.
Uses & applications
Used in gemstone carvings, lapidary cabochons for jewelry, ornamental decor, and as an abrasive in some industrial polishing applications.
Geological facts
Jasper was a favorite gem in antiquity; green jasper specifically was highly prized in ancient Egypt for amulets and seals. It is considered 'opaque' chalcedony due to its heavy mineral inclusion content.
Field identification & locations
Identify in the field by its characteristic smooth, shell-like (conchoidal) fracture and its inability to be scratched by a steel knife. Commonly found in riverbeds or coastal areas in Oregon (USA), India, Russia, and Brazil.
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