sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
Hardness: 6.5-7 Mohs; Color: Forest green to olive green; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Forest green to olive green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Forest green to olive green; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the accumulation of silica-rich fluids in volcanic ash or sedimentary beds, often through hydrothermal replacement. The green color is typically caused by iron silicate minerals like chlorite.
Uses & applications
Commonly used as a gemstone for beads, cabochons, and ornamental carvings. It is popular in jewelry and for metaphysical collecting.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as the 'rain bringer' and was considered a powerful protective stone in ancient various cultures.
Field identification & locations
Identify by its opacity (unlike translucent green aventurine), smooth waxy texture when tumbled, and conchoidal fracture patterns. Found globally in India, Brazil, and the USA.
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