sedimentary

Kambaba Jasper

Stromatolite (fossilized algae)

Hardness: 6.5-7 (Mohs scale); Color: Dark green to black with orbicular swirls of lighter green; Luster: Dull to vitreous; Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.6-2.9

Hardness: 6
Color: Dark green to black with orbicular swirls of lighter green
Luster: Dull to vitreous

Identified July 14, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Dark green to black with orbicular swirls of lighter green; Luster: Dull to vitreous; Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.6-2.9

Formation & geological history

Formed through the fossilization of blue-green algae (cyanobacteria) in sedimentary layers over 3 billion years ago. These structures are known as stromatolites.

Uses & applications

Primarily used in jewelry, decorative carvings, palm stones for meditation, and as a collectible geological specimen.

Geological facts

Kambaba Jasper is not technically a true jasper but rather a rare fossilized formation of cyanobacteria. It is one of the oldest known fossils on Earth, representing some of the earliest life forms.

Field identification & locations

Identify by its distinctive 'crocodile' pattern of dark green circles on a lighter background. It is almost exclusively found in the west-central Bongolava region of Madagascar. Collectors look for high contrast in the swirling patterns.