sedimentary
Jasper (Green Jasper / River Jasper)
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs scale); Color: Deep green with brownish-grey bands; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.6-2.9
- Hardness
- 6
- Color
- Deep green with brownish-grey bands
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Deep green with brownish-grey bands; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.6-2.9
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic or sedimentary environments. These river-worn specimens are often sourced from ancient volcanic beds and have been tumbled smooth over thousands of years.
Uses & applications
Used primarily for lapidary work, jewelry making (cabochons), river rock landscaping, and as a decorative collector's stone.
Geological facts
Green jasper was often referred to as 'the bringer of rain' in ancient folklore and has been used for seals and jewelry for over 5,000 years, including in the Minoan civilization.
Field identification & locations
Identify in the field by its extreme hardness (will scratch glass), smooth texture when wet, and opaque nature. Common in riverbeds and coastal regions with volcanic history.
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