mineral
Ocean Jasper
Spherulitic Chalcedony (SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Multicolored with concentric circles (orbicular), Luster: Vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None, Specific Gravity: 2.58-2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Multicolored with concentric circles (orbicular), Luster: Vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None, Specific Gravity: 2.58-2.64
Formation & geological history
Formed as a secondary mineral in late-stage rhyolitic volcanic flows where silica-rich fluids filled cavities, creating orbicular structures through spherulitic growth. Found primarily in Madagascar.
Uses & applications
Polished for ornamental use, jewelry, lapidary art, and popular among mineral collectors and metaphysical practitioners.
Geological facts
The term Ocean Jasper is a trade name for a specific variety of orbicular jasper found only on the coast of Madagascar, often accessible only at low tide by boat.
Field identification & locations
Identify by eye-like circular patterns or 'orbs' set in a translucent to opaque matrix. It is found in the Analalava district of the Sofia region in Northwest Madagascar.
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