sedimentary

Kambaba Jasper (Crocodile Jasper)

Rhyolite containing Fossilized Cyanobacteria (Stromatolite)

AI-generated identification · may be incorrect

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

Identified April 12, 2026More sedimentary →

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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.