sedimentary
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
Hardness: 6.5-7 (Mohs), Color: Pale to olive green with dark green mottled inclusions, Luster: Vitreous to waxy, Crystal Structure: Hexagonal/Microcrystalline, Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Pale to olive green with dark green mottled inclusions, Luster: Vitreous to waxy, Crystal Structure: Hexagonal/Microcrystalline, Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the accumulation of silica from either volcanic ash or mineral-rich water, often in volcanic or sedimentary environments. The green color is typically caused by silicate iron minerals like chlorite.
Uses & applications
Primarily used for ornamental purposes, lapidary work (cabochons, beads), decorative objects, and as a popular stone for tumbling and crystal healing collections.
Geological facts
Jasper was a favorite gem in the ancient world, mentioned in several historical texts including the Bible. Green jasper specifically was often associated with rain-bringing rituals in medieval folklore.
Field identification & locations
Look for a smooth, matte to waxy surface that cannot be scratched by a steel knife. It will have a conchoidal fracture and an opaque appearance. Common in river beds and weathered volcanic regions.
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