Kambaba Jasper
Rhyolite (Stromatolite Jasper) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal/Microcrystalline; typically occurs in massive, rounded, or tumbled forms without visible external crystal symmetry
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (Mainly Quartz) with inclusions of Pyroxene and Amphibole minerals
Formation Process
Sedimentary/Volcanic; initially thought to be a fossilized stromatolite (Cyanobacteria), current mineralogical analysis suggests it is a volcanic rhyolite containing circular cooling structures called spherulites
About This Crystal
Opaque stone with a dark green to black base color, featuring distinctive swirling patterns of lighter forest green, lime green, or grayish-green circles and orbs. It has a vitreous to waxy luster and a smooth, dense surface when polished.
Physical Characteristics
Color: Dark green with lighter green orbs; Streak: White to pale green; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.6–2.9; Tenacity: Brittle; Fluorescence: Generally none
Optical Properties
Refractive Index: 1.544–1.553 (approximate for Quartz-based content); Birefringence: Weakly double refractive; Opacity: Opaque; Pleochroism: None
Hardness & Durability
Origin Region
Primarily the Bongolava region of West-Central Madagascar; found in volcanic sedimentary formations
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: High due to microcrystalline structure; Stability: Stable under heat and light, though acid sensitive due to varied mineral inclusions
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic cleaners and harsh chemicals; store away from harder stones like Topaz or Sapphire to prevent scratching
Rarity & Value
Common; relatively inexpensive and widely available. Value is determined by the clarity and contrast of the orbital patterns. Rarely treated or enhanced.
Special Characteristics
Features unique 'orbital' or 'orbicular' patterns resembling crocodile skin (hence the nickname 'Crocodile Jasper'); contains unique inclusions of amphiboles like riebeckite or aegirine
Lore & History
Historically associated with peace and tranquility; often marketed as a 'fossilized' stone linked to ancient life on Earth. In metaphysical traditions, it is associated with the Heart and Base chakras and believed to facilitate grounding and emotional steadying.