sedimentary
Kambaba Jasper (Crocodile Jasper)
Rhyolite containing Fossilized Cyanobacteria (Stromatolite)
Hardness: 6.5-7 (Mohs scale); Color: Deep forest green with black circular or orbicular patterns; Luster: Vitreous to dull; Crystal structure: Microcrystalline quartz; Specific gravity: 2.6-2.9
- Hardness
- 6
- Color
- Deep forest green with black circular or orbicular patterns
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Deep forest green with black circular or orbicular patterns; Luster: Vitreous to dull; Crystal structure: Microcrystalline quartz; Specific gravity: 2.6-2.9
Formation & geological history
Formed from sediment and prehistoric algae (cyanobacteria) that lived approximately 3 billion years ago. It is technically an sedimentary rock containing stromatolite structures that was later silicified.
Uses & applications
Primarily used in jewelry (beads, cabochons), ornamental carvings, and as a popular stone for meditation and crystal collecting.
Geological facts
Despite the name 'Jasper', many geologists argue it is actually a volcanic rhyolite or a stromatolite fossil. It is often called 'Crocodile Jasper' due to its skin-like patterns and coloration.
Field identification & locations
Identify in the field by its distinct dark green groundmass with dark concentric circles (orbs). It is almost exclusively sourced from Madagascar. Collectors look for high contrast and well-defined 'eye' patterns.
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