sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Deep green with white/cream spherulitic inclusions; Luster: Vitreous to waxy; Crystal structure: Hexagonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep green with white/cream spherulitic inclusions
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Deep green with white/cream spherulitic inclusions; Luster: Vitreous to waxy; Crystal structure: Hexagonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the flow of silica-rich hydrothermal fluids through volcanic rock (rhyolite), cooling to create unique orbicular patterns. Found specifically in the Marovato region of Madagascar along the coast.
Uses & applications
Predominantly used for ornamental carvings, jewelry (cabochons), and as high-end collector specimens. Valued in the metaphysical community for its unique appearance.
Geological facts
Ocean Jasper is only found in one specific location in Madagascar and can often only be mined during low tide. The original vein (Kabamby) was exhausted, and newer veins have slightly different color palettes.
Field identification & locations
Identify by its unique 'orbicular' circular patterns (spherulites) against a dark base. It is frequently polished to reveal the 'flower' like patterns and has a concave or conchoidal fracture if broken.
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