sedimentary
Kambaba Jasper
Rhyolite (with Stromatolite fossil inclusions)
Hardness: 6.5-7 (Mohs scale); Color: Dark green with black circular patterns or splotches; Luster: Dull to vitreous when polished; Crystal Structure: Microcrystalline; Specific Gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Dark green with black circular patterns or splotches
- Luster
- Dull to vitreous when polished
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Dark green with black circular patterns or splotches; Luster: Dull to vitreous when polished; Crystal Structure: Microcrystalline; Specific Gravity: 2.6-2.9.
Formation & geological history
Formed in Africa (Madagascar and South Africa) through the fossilization of blue-green algae (Cyanobacteria) colonies in volcanic rhyolite. It dates back to the Archean Eon, over 3 billion years ago.
Uses & applications
Primarily used for lapidary work, jewelry, decorative carvings, and as a collector's specimen. It is popular in metaphysical circles for grounding and meditation.
Geological facts
Despite being called 'Jasper' in the trade, it is technically an exotic rhyolite featuring fossilized stromatolites, which are Earth's oldest known fossils.
Field identification & locations
Identify by its unique 'crocodile skin' appearance (distinct green color with circular black spots). Found predominantly in the Bongolava region of Madagascar and the rift valleys of South Africa.
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