sedimentary

Kambaba Jasper

Stromatolite (Fossilized Algae)

Hardness: 6.5-7 (Mohs); Color: Dark green with black circular or orbicular patterns; Luster: Vitreous to dull; Crystal structure: Microcrystalline (Cryptocrystalline quartz); Cleavage: None

Hardness: 6
Color: Dark green with black circular or orbicular patterns
Luster: Vitreous to dull

Identified May 11, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Dark green with black circular or orbicular patterns; Luster: Vitreous to dull; Crystal structure: Microcrystalline (Cryptocrystalline quartz); Cleavage: None

Formation & geological history

Formed roughly 3 billion years ago (Archean Eon) in Madagascar and South Africa. It is a sedimentary fossilized formation created by cyanobacteria (blue-green algae) that formed microbial mats, trapping and binding sediment particles over time.

Uses & applications

Primarily used for lapidary purposes including jewelry (cabochons), interior decor, crystal healing, and as polished collector specimens.

Geological facts

Despite being called 'jasper' in the trade, it is actually a fossilized stromatolite rather than a traditional jasper. It represents some of the earliest evidence of life on Earth.

Field identification & locations

Identify by its unique green base with distinct black orbs (eyes) that resemble 'crocodile skin.' It is almost exclusively mined in the west-central Bongolava region of Madagascar.