sedimentary
Green Jasper
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs); Color: Olive to forest green with white quartz veining; Luster: Vitreous to waxy; Crystal structure: Microcrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Olive to forest green with white quartz veining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Olive to forest green with white quartz veining; Luster: Vitreous to waxy; Crystal structure: Microcrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific gravity: 2.6-2.9.
Formation & geological history
Green Jasper is a variety of chalcedony formed through the precipitation of silica-rich fluids in volcanic ash or sedimentary beds. The green color is primarily caused by silicate mineral inclusions like chlorite or iron oxides. It can form in various geological ages ranging from the Precambrian to recent eras.
Uses & applications
Extensively used for lapidary work, jewelry (beads, cabochons), ornamental carvings, and as a popular specimen for rock tumbling and crystal healing collections.
Geological facts
Jasper has been used throughout history as a 'sacred stone.' In ancient civilizations, it was used for cylinder seals and amulets. The white lines visible in this specimen are quartz veins that filled fractures in the original jasper rock.
Field identification & locations
Identify in the field by its opaque green color, smooth waxy texture when polished, and its ability to scratch glass but not be scratched by a steel knife. It is commonly found in riverbeds, coastal areas, and mountain ranges in regions like India, Russia, Brazil, and the Western United States.
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