sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron and silicate inclusions
Hardness: 6.5-7 on Mohs scale; Color: olive green to dark green with brown veining; Luster: vitreous to waxy; Crystal Structure: microcrystalline (trigonal); Cleavage: none; Specific Gravity: 2.6-2.9
- Hardness
- 6
- Color
- olive green to dark green with brown veining
- Luster
- vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: olive green to dark green with brown veining; Luster: vitreous to waxy; Crystal Structure: microcrystalline (trigonal); Cleavage: none; Specific Gravity: 2.6-2.9
Formation & geological history
Formed through the accumulation of fine volcanic ash or silica-rich sediments. The green color is typically caused by silicate minerals like chlorite or iron oxides. Often found as water-worn pebbles in riverbeds.
Uses & applications
Used for lapidary work, jewelry (beads, cabochons), ornamental carvings, and as a popular collector's stone for its aesthetic patterns.
Geological facts
Jasper is an opaque variety of chalcedony. Since ancient times, green jasper was highly valued; it was mentioned by Pliny the Elder as a stone of protection and physical healing.
Field identification & locations
Identify in the field by its opacity, conchoidal fracture (chip marks that look like glass), and inability to be scratched by a steel knife. Commonly found in river deposits and gravel pits globally.
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