Ocean Jasper
Quartz var. Orbicular Jasper (Chalcedony) · Semi-Precious Gemstone / Collector Mineral
Crystal System
Trigonal/Hexagonal; Cryptocrystalline (Microcrystalline) habit, forming in massive, orbicular, and spherulitic structures.
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 (Silicon Dioxide) with impurities of Iron, Manganese, and Aluminum Silicates
Formation Process
Hydrothermal/Volcanic; silica-rich fluids precipitated within rhythmic rhythmic cavities or fractures in volcanic rock, where spherulites (orbs) formed due to radial growth of quartz and feldspar needles.
About This Crystal
Deep forest green to black base color with distinct white, grey, and pale green orbicular (eye-like) patterns. The specimen is shaped into a polished sphere (orb) with a vitreous to waxy luster and opaque transparency.
Physical Characteristics
Color: Dark green with white/tan circular inclusions. Streak: White. Cleavage: None. Fracture: Conchoidal. Specific Gravity: 2.58–2.91. Tenacity: Brittle. Non-fluorescent under UV light.
Optical Properties
Refractive Index: 1.544–1.553. Birefringence: 0.009. Pleochroism: None. Optical Effect: Orbicular patterning caused by radial growth of needle-like crystals (spherulites).
Hardness & Durability
Origin Region
Exclusively from the Analalava district of the Sofia region in Northwest Madagascar; formed in volcanic environments within silicified rhyolite or tuff.
Hardness & Durability
Mohs Hardness: 6.5–7. Excellent toughness and stability for jewelry, though surface pits are common due to the nature of the inclusions.
Care & Maintenance
Safe to clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners if the stone has natural pits or fissures. Store away from harder stones like Sapphire or Diamond to prevent scratching.
Rarity & Value
Relatively Rare; the original deposits are largely depleted and only accessible at low tide along the coast. Value is determined by the clarity of the 'eyes' (orbs) and color contrast.
Special Characteristics
Orbicular or spherulitic patterning. Some specimens may contain druzy quartz pockets or enhydro (liquid) inclusions, though this specific sphere appears solid and well-polished.
Lore & History
Discovered/Rediscovered in 1999, though samples were known in the 1950s. Traditionally associated with the Solar Plexus, Heart, and Throat chakras; symbolically linked to the ebb and flow of emotions and the ocean's energy.