sedimentary/fossil

Kambaba Jasper

Stromatolite

Hardness: 6.5-7 on the Mohs scale. Color: Dark green to black with distinct light green to yellowish-green circular patterns. Luster: Vitreous to dull. Crystal structure: Microcrystalline quartz. Cleavage: None. Specific gravity: 2.58-2.91.

Hardness: 6
Luster: Vitreous to dull

Identified July 11, 2026More sedimentary/fossil →

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Physical properties

Formation & geological history

Kambaba Jasper is a fossilized stromatolite, formed by the fossilization of blue-green algae (cyanobacteria) over 3 billion years ago. The distinct circular patterns are the fossilized remains of the algae colonies.

Uses & applications

Kambaba Jasper is primarily used in jewelry making, lapidary arts, and as a decorative stone. It is often cut into cabochons, carved into various shapes, or tumbled.

Geological facts

Kambaba Jasper is often mistakenly referred to as a type of jasper, but it is actually a fossilized stromatolite. It is primarily found in the South African Rift Valley and Madagascar.

Field identification & locations

Identify it by its distinct contrasting dark green to black background with lighter green circular patterns. Found mostly in Madagascar. Collectors value pieces with clear, well-defined circular patterns.