sedimentary
Green Jasper (with Quartz veining)
Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2
Hardness: 6.5–7 (Mohs scale); Color: Dark forest green with white/light-grey translucent veining; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Dark forest green with white/light-grey translucent veining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Dark forest green with white/light-grey translucent veining; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58–2.91
Formation & geological history
Formed through the deposition of silica from water or hydrothermal fluids into rock cavities or through the replacement of organic materials. The color comes from iron silicate inclusions (celadonite or chlorite). Found in volcanic and sedimentary environments across various geological ages from Precambrian to recent.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and decorative carvings. Used historically for cylinder seals and amulets. Significant in modern metaphysical collections and as aquarium/landscaping stone.
Geological facts
In medieval times, green jasper was known as a 'rain-bringer' and was believed to have the power to drive away evil spirits. The light-colored bands are likely quartz-filled fractures formed during tectonic stress.
Field identification & locations
Identify in the field by its waxy texture when wet, high hardness (cannot be scratched by a steel knife), and smooth conchoidal (shell-like) fracture surfaces. Commonly found in riverbeds or beaches where harder silica-rich rocks accumulate.
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