sedimentary
Green Jasper
Silicon Dioxide (SiO2)
Hardness: 6.5-7 Mohs; Color: Forest green with potential inclusions; Luster: Dull to Vitreous; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Forest green with potential inclusions
- Luster
- Dull to Vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Forest green with potential inclusions; Luster: Dull to Vitreous; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed when silica-rich fluids deposit in fractures or voids within other rocks, or through the replacement of organic materials. Often associated with volcanic environments.
Uses & applications
Used primarily for ornamental items, jewelry (cabochons), lapidary art, and as a healing stone in metaphysical practices.
Geological facts
The word Jasper comes from the Greek 'iaspis', meaning 'spotted stone'. It is an opaque variety of chalcedony. In ancient times, green jasper was highly prized for rain-making ceremonies.
Field identification & locations
Identify by its opacity (even when held to light), its hardness (will scratch glass), and its smooth, waxy feel when polished. Commonly found in riverbeds and coastal regions globally.
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