sedimentary

Kambaba Jasper

Stromatolite (Fossilized Algae)

Hardness: 6.5-7 (Mohs scale); Color: Deep green with black circular swirls or spots; Luster: Vitreous to dull; Crystal Structure: Microcrystalline (Quartz/Chalcedony structure); Cleavage: None.

Hardness: 6
Color: Deep green with black circular swirls or spots
Luster: Vitreous to dull

Identified June 5, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Deep green with black circular swirls or spots; Luster: Vitreous to dull; Crystal Structure: Microcrystalline (Quartz/Chalcedony structure); Cleavage: None.

Formation & geological history

Formed by cyanobacteria (blue-green algae) that created structures called stromatolites billions of years ago. These were then mineralized with silica. These specimens are primarily found in Madagascar and South Africa, dating back over 3 billion years.

Uses & applications

Primarily used in jewelry, lapidary arts (cabochons, beads), decorative carvings, and as a popular stone for mineral collectors and metaphysical practitioners.

Geological facts

Despite being called a Jasper, it is technically a fossilized stromatolite. It represents some of the oldest records of life on Earth, as the circular patterns are ancient microbial colonies.

Field identification & locations

Identified by its unique 'orbicular' pattern of black circles on a dark green background. Collectors should look for high contrast between the green and black areas and a high polish. Common in Madagascar.