Kambaba Jasper

Physical Properties

Hardness: 6.5-7 (Mohs scale); Color: Deep green with black circular or swirling patterns; Luster: Vitreous to dull (polished in photo); Crystal Structure: Trigonal; Specific Gravity: ~2.6.

Formation & Geological History

Formed by fossilized prehistoric blue-green algae (cyanobacteria) that created mounds known as stromatolites. Found in the Bongolava region of Madagascar, these date back nearly 3 billion years to the Archean Eon.

Uses & Applications

Primarily used for lapidary work, including polished spheres, cabochons for jewelry, decorative home decor, and as a popular stone for crystal healing and mineral collectors.

Geological Facts

Despite being called 'Jasper', it is technically an ancient fossil of stromatolites. It is often confused with Nebula Stone or Crocodile Jasper, but its signature 'eyes' (clumps of algae) are unique to its origin.

Field Identification & Locations

Identify by its unique 'orbicular' dark green/black swirls against a lighter green background. It is mostly found in the West-Central region of Madagascar. Collectors look for high contrast and intact circular patterns.

Identified on: 4/22/2026

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