sedimentary
Green Jasper
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs scale); Color: Varieties of green, often with mottled or swirled patterns; Luster: Dull or waxy; Crystal structure: Microcrystalline (trigonal); Cleavage: None/Conchoidal fracture.
- Hardness
- 6
- Color
- Varieties of green, often with mottled or swirled patterns
- Luster
- Dull or waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Varieties of green, often with mottled or swirled patterns; Luster: Dull or waxy; Crystal structure: Microcrystalline (trigonal); Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed from silica-rich fluids occurring in volcanic ash beds or sedimentary deposits where the silica precipitates and fills cavities. It can date back hundreds of millions of years, often associated with hydrothermal activity.
Uses & applications
Commonly used in jewelry as beads or cabochons, for ornamental carvings, and historical use in seal stones and talismans.
Geological facts
Green Jasper was highly prized in the ancient world; in the medieval period, it was believed to bring rain and drive away evil spirits. It is frequently confused with Green Aventurine, though it lacks the sparkly 'aventurescence' effect.
Field identification & locations
Identify in the field by its opaque nature (it does not transmit light even on thin edges), its hardness (will scratch glass), and its smooth, shell-like fracture pattern. Frequently found in riverbeds and coastal areas.
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