sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
Hardness: 6.5-7 (Mohs); Color: Olive to forest green; Luster: Dull to waxy; Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture)
- Hardness
- 6
- Color
- Olive to forest green
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Olive to forest green; Luster: Dull to waxy; Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture)
Formation & geological history
Formed from silica-rich fluids in volcanic regions or sedimentary environments, often found as water-worn pebbles in stream beds or beaches. The green color usually comes from iron silicate minerals like chlorite.
Uses & applications
Used primarily in lapidary work for cabochons, beads, and decorative ornaments. It is also a popular stone for tumbling and crystal healing practices.
Geological facts
Jasper was a favorite gem in antiquity; green jasper specifically was highly prized in ancient Egypt for amulets and scarabs to ensure the health of the deceased.
Field identification & locations
Identify by its opacity (unlike translucent jade) and its smoothness despite high hardness. Commonly found along the Pacific coast of the US and in riverbeds in India and Brazil.
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