sedimentary
Green Jasper / Chalcedony
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 Mohs; Color: Dark green with translucency; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Dark green with translucency
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Dark green with translucency; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed from silica-rich fluids precipitating in volcanic rock cavities or sedimentary environments, often associated with hydrothermal activity. Can be millions of years old.
Uses & applications
Used primarily for ornamental purposes, lapidary art, jewelry, and as a collector's specimen.
Geological facts
Jasper is an opaque variety of chalcedony. When it shows significant translucency as seen in this image, it may be classified as green chalcedony or plasma.
Field identification & locations
Identify by its waxy luster, smooth conchoidal fracture when broken, and inability to be scratched by a steel knife. Commonly found in Brazil, India, and the USA.
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