sedimentary
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
Hardness: 6.5-7.0 (Mohs scale), Color: Dark forest green to mottled olive, Luster: Vitreous to waxy, Crystal Structure: Microcrystalline (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: Dark forest green to mottled olive, Luster: Vitreous to waxy, Crystal Structure: Microcrystalline (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the accumulation of silica in volcanic ash or sedimentary environments where minerals like chlorite or actinolite provide the green pigment. It is often millions of years old, originating from the Paleozoic or Mesozoic eras.
Uses & applications
Used primarily in jewelry making for cabochons and beads, as well as decorative carvings, tumbled stones, and as a popular specimen for crystal collecting and lapidary work.
Geological facts
Green Jasper was highly prized in the ancient world for its supposed ability to drive away evil spirits and bring rain. It is often referred to as the 'rain bringer'.
Field identification & locations
Identify in the field by its hardness (cannot be scratched by a steel knife), smooth waxy feel when polished, and dense, opaque appearance. Commonly found in riverbeds and coastal regions of India, Brazil, and the USA.
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