sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
Hardness: 6.5-7 (Mohs), Color: Pale to deep green with possible banding, Luster: Vitreous to waxy (when polished), Crystal structure: Hexagonal (microcrystalline), Cleavage: None, Fracture: Conchoidal.
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Pale to deep green with possible banding, Luster: Vitreous to waxy (when polished), Crystal structure: Hexagonal (microcrystalline), Cleavage: None, Fracture: Conchoidal.
Formation & geological history
Formed primarily from the deposition of silica from water containing impurities. It often forms in volcanic environments or in sedimentary beds where silica-rich fluids permeate porous rock or ash.
Uses & applications
Commonly used for lapidary work, cabochons, jewelry, decorative ornaments, and as a popular pocket stone for collectors.
Geological facts
Green Jasper was considered a powerful 'rain bringer' in ancient civilizations. Unlike Green Aventurine, it lacks the 'aventurescence' (sparkling effect) and has a more solid, opaque to translucent waxy look.
Field identification & locations
Identified in the field by its hardness (will scratch glass), smooth conchoidal fracture, and lack of transparency. Common in riverbeds or coastal areas where volcanic activity occurred.
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