sedimentary
Green Jasper
Silicon Dioxide (SiO2) with impurities of iron(II) silicate
Hardness: 6.5-7 (Mohs scale); Color: Dark green to forest green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.63-2.65
- Hardness
- 6
- Color
- Dark green to forest green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Dark green to forest green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.63-2.65
Formation & geological history
Formed from the deposition of silica from volcanic ash or water-borne sources that slowly permeates through organic materials or other sedimentary rocks. Often found in hydrothermal vents or as nodules in volcanic rocks.
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative carvings, and as a collector's stone. Historically used for seal stones and amulets.
Geological facts
Green Jasper was known as 'the rain bringer' in ancient folklore. It is an opaque variety of chalcedony that owes its color to the presence of chlorite or iron silicates.
Field identification & locations
Identify in the field by its waxy luster when wet and its inability to be scratched by a steel knife. Commonly found in riverbeds, coastal areas, and mountain ranges in regions like India, Brazil, and the USA.
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