Kambaba Jasper
Stromatolitic Rhyolite (Crocidolite/Riebeckite-bearing) · Decorative Stone / Semi-Precious Gemstone
Crystal System
Monoclinic (microcrystalline/cryptocrystalline) with massive habit; composed of micro-quartz and amphibole aggregates.
Mineral Group
Silicates (Tectosilicate matrix with Inosilicate inclusions)
Chemical Formula
SiO2 (Quartz) with (Na2(Fe,Mg)3Fe2Si8O22(OH)2) inclusions
Formation Process
Sedimentary/Metamorphic; it is often debated between being a fossilized stromatolite (cyanobacteria) or a volcanic rhyolite that has undergone silicification.
About This Crystal
An opaque, dark green to black stone characterized by orbicular 'eye' patterns or swirling dark green forest patches. It exhibits a vitreous to dull luster depending on the polish.
Physical Characteristics
Color: Dark green, black, and olive. Streak: White/Light Green. Cleavage: None. Fracture: Conchoidal to splintery. Specific Gravity: 2.6 - 2.9. Fluorescence: Generally none.
Optical Properties
Refractive Index: ~1.54 (aggregate). Birefringence: None (opaque). Pleochroism: None. Noted for its orbicular patterns rather than light play.
Hardness & Durability
Origin Region
West-Central Bongolava region of Madagascar; primarily found in sedimentary/volcanic basins.
Hardness & Durability
Mohs Hardness: 6.5 to 7. Toughness: High (durable). Stable under most conditions but can vary if high concentrations of softer amphiboles are present.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid harsh chemicals and ultrasonic cleaners if the stone has surface-reaching fractures. Store away from harder gems like Topaz or Sapphire.
Rarity & Value
Common to Uncommon. Value is determined by the clarity and contrast of the 'eyes' or circular patterns. Generally affordable, often sold as cabochons, beads, or carvings.
Special Characteristics
Features distinct orbicular or spherulitic patterns (often called 'eyes') which are dark green to black against a lighter moss-green background.
Lore & History
Commonly known as 'The Stone of Peace.' Historically misidentified as a jasper, it is frequently used in modern crystal healing for grounding and heart chakra work. It is associated with ancient Earth energy due to its resemblance to fossilized algae.