sedimentary
Green Jasper
Silicon Dioxide (SiO2)
Hardness: 6.5–7 (Mohs scale); Color: Deep green to olive; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6–2.9
- Hardness
- 6
- Color
- Deep green to olive
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Deep green to olive; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6–2.9
Formation & geological history
Formed through the accumulation of fine siliceous materials in sedimentary environments or volcanic ash deposits where silica-rich fluids permeate the material over millions of years. This specimen appears to be a river-worn pebble.
Uses & applications
Commonly used in lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a decorative stone in aquariums or landscaping.
Geological facts
Jasper has been used by humans for thousands of years; ancient civilizations used green jasper for seals and amulets. It is often referred to as the 'rain bringer' in Native American folklore.
Field identification & locations
Identify in the field by its opacity (unlike translucent chrysoprase), its smooth waxy feel, and its inability to be scratched by a steel knife. Commonly found in river beds and coastlines globally, notably in India, Brazil, and the Western USA.
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