sedimentary

Raw Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

AI-generated identification · may be incorrect

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

Identified March 25, 2026More sedimentary →

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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.