Ocean Jasper
Quartz var. Jasper (Orbicular Jasper) · Semi-Precious Gemstone / Collector Mineral
Crystal System
Trigonal/Hexagonal system with microcrystalline habit. Typically occurs in massive or botryoidal forms with spherulitic (orbicular) structures.
Mineral Group
Silicates (Tectosilicate group, Chalcedony variety)
Chemical Formula
SiO2 (Silicon Dioxide) with inclusions of Iron oxides (Goethite, Hematite) and Aluminum silicates
Formation Process
Hydrothermal/Volcanic: Silica-rich fluids precipitated in voids of volcanic rock (rhyolite). The orbicular patterns form through a process of spherulitic crystallization around a central nucleus.
About This Crystal
An opaque to translucent microcrystalline quartz with a vitreous to earthy luster. This specimen shows a mustard-yellow matrix with a dark green or grey-blue central band containing distinct small spherulites or 'orbs' that are cream-colored with dark centers.
Physical Characteristics
Color: Yellow, green, cream; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.63 - 2.65; Fluorescence: Usually inert but can show weak yellow or green under LWUV.
Optical Properties
Refractive Index: Approx. 1.544 - 1.553; Birefringence: Weak (0.009); Optical Character: Uniaxial positive; Generally displays no pleochroism due to aggregate structure.
Hardness & Durability
Origin Region
Primarily the Marovato region on the northwest coast of Madagascar. Formed in volcanic tuff or rhyolite through hydrothermal activity.
Hardness & Durability
Mohs Hardness: 6.5 - 7; Toughness: Excellent; Stability: Very stable, resistant to most household chemicals and light fading.
Care & Maintenance
Wash with warm soapy water and a soft brush. Ultrasonic cleaners are generally safe but avoid if there are visible surface-reaching fractures. Store separately from softer stones.
Rarity & Value
Uncommon to Rare; Original deposits in Madagascar are largely exhausted, leading to rising prices. Value is based on 'orb' definition, color combinations, and polish quality.
Special Characteristics
Orbicular/Spherulitic texture: The presence of circular radial structures. Often contains small druzy quartz pockets or 'vugs' within the massive material.
Lore & History
First discovered in 1922 but lost for decades until rediscovered in 1999. Traditionally associated with the Solar Plexus and Heart chakras; culturally symbolized as a stone of renewal and strength in modern lapidary circles.