sedimentary
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
Hardness: 6.5-7.0 (Mohs scale), Color: Sage to deep green, Luster: Dull to waxy, Crystal Structure: Microcrystalline/Trigonal, Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: Sage to deep green, Luster: Dull to waxy, Crystal Structure: Microcrystalline/Trigonal, Specific Gravity: 2.6-2.9
Formation & geological history
Formed from the deposition of silica-rich fluids within cracks or volcanic ashes, often associated with hydrothermal activity or sedimentary environments.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons), polished river stones, and as a decorative collector's piece.
Geological facts
The green color typically comes from inclusions of silicate minerals like chlorite or actinolite. It has been used since ancient times for amulets and seals.
Field identification & locations
Identify by its 'conchoidal' (shell-like) fracture and high hardness (it cannot be scratched by a steel knife). Commonly found in riverbeds and mountainous terrain in regions like California, Oregon, and India.
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