sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
Hardness: 6.5-7 (Mohs scale); Color: Olive to dark green; Luster: Dull to waxy; Structure: Microcrystalline; Specific Gravity: 2.58-2.91; Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Olive to dark green
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Olive to dark green; Luster: Dull to waxy; Structure: Microcrystalline; Specific Gravity: 2.58-2.91; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed via the precipitation of silica from hot, mineral-rich circulating fluids within cracks and cavities of volcanic or sedimentary rocks. This specimen's smoothed shape is the result of water erosion, likely in a river or coastal environment.
Uses & applications
Ornamental stone, lapidary work (cabochons), historical use for seals, and popular in contemporary gemstone collecting and jewelry.
Geological facts
Jasper is an opaque variety of chalcedony. In ancient times, green jasper was highly prized for its supposed ability to bring rain and its association with fertility. Its color comes predominantly from chlorite or iron-containing silicate minerals.
Field identification & locations
Identified by its extreme hardness (cannot be scratched by a steel knife) and opaque green color. The location provided (Antalya, Turkey region) is geologically rich in sedimentary and metamorphic formations where jasper and other microcrystalline silicates are common.
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