sedimentary

Green Jasper

Silicon Dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs), Color: Deep green with brownish-red inclusions, Luster: Vitreous to waxy when polished, Crystal Structure: Microcrystalline/Cryptocrystalline (Trigonal), Cleavage: None, Specific Gravity: 2.58-2.91

Hardness: 6

Identified June 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of silica-rich volcanic ash or sedimentary deposits that undergo mineralization over millions of years, often colored by iron silicates or chlorite.

Uses & applications

Widely used for lapidary work including cabochons, beads, decorative carvings, and as a collector's specimen. Known as a grounding stone in metaphysical circles.

Geological facts

Green Jasper was highly prized in the ancient world for its supposed ability to bring rain and drive away evil spirits. It is frequently mentioned in historical texts as a primary material for seals and amulets.

Field identification & locations

Identify by its opacity, smooth conchoidal fracture, and inability to be scratched by a steel knife. Commonly found in river beds and coastal areas globally, especially in Oregon (USA), India, and Russia.