sedimentary
Kambaba Jasper
Stromatolite (Fossilized Algae)
Hardness: 6.5-7 (Mohs); Color: Deep green to black with swirling patterns and ‘eye’ spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline quartz; Cleavage: None; Specific Gravity: 2.6-2.9
- Hardness
- 6
- Color
- Deep green to black with swirling patterns and ‘eye’ spots
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep green to black with swirling patterns and ‘eye’ spots; Luster: Vitreous to dull; Crystal structure: Microcrystalline quartz; Cleavage: None; Specific Gravity: 2.6-2.9
Formation & geological history
Formed over 3 billion years ago (Archean or Proterozoic eons) through the fossilization of blue-green algae (cyanobacteria) which created layered microbial mats called stromatolites in aquatic environments.
Uses & applications
Primarily used for lapidary arts, decorative carvings (like this mushroom charm), jewelry beads, and as a popular specimen for metaphysical collectors.
Geological facts
Despite its common name, it is technically a fossilized stromatolite rather than a true jasper. It contains some of the oldest records of life on Earth.
Field identification & locations
Identify by its unique 'orbicular' or swirling green-and-black patterns. It is almost exclusively found in the west-central Bongolava region of Madagascar. Collectors look for high contrast in the patterns.
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