sedimentary
Green Jasper
Silicon Dioxide (SiO2) with impurities
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
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Physical properties
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
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.
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