sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
Hardness: 6.5-7 (Mohs scale); Color: Olive to forest green; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Olive to forest green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Olive to forest green; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the precipitation of silica from water-rich environments, often occurring in hydrothermal veins or as nodules in volcanic rocks where iron minerals provide the green pigmentation.
Uses & applications
Used primarily in lapidary work for cabochons, beads, and decorative carvings. It is popular in metaphysical collecting and as a tumbled stone.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, green jasper was highly prized in the ancient world for its supposed ability to bring rain and drive away evil spirits.
Field identification & locations
Identify by its opacity (unlike translucent jade) and its high hardness (doesn't scratch with steel). It is commonly found in riverbeds and coastal regions of the Pacific Northwest and India.
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