sedimentary

Kambaba Jasper

Stromatolite Jasper (Microcrystalline Quartz with Cyanobacteria fossile)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Deep forest green with black swirling orbs; Luster: Vitreous to dull; Structure: Microcrystalline; Specific Gravity: 2.6-2.7

Hardness: 6
Color: Deep forest green with black swirling orbs
Luster: Vitreous to dull

Identified May 11, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Deep forest green with black swirling orbs; Luster: Vitreous to dull; Structure: Microcrystalline; Specific Gravity: 2.6-2.7

Formation & geological history

It is a fossilized algae (stromatolite) dating back approximately 3 billion years, formed through the precipitation of calcium carbonate or silica by cyanobacteria in ancient shallow marine environments.

Uses & applications

Primarily used for lapidary work, decorative spheres, carvings, jewelry, and as a collector's specimen due to its unique fossil patterns.

Geological facts

Though called 'Jasper', it is actually a fossilized stromatolite. It contains records of some of the earliest life forms on Earth that oxygenated our atmosphere.

Field identification & locations

Identified by its distinctive dark green base and 'crocodile-like' black circular patterns. Primarily sourced from the Bongolava region in west-central Madagascar.