Mineral (Variety of Quartz)
Ocean Jasper
Silicon Dioxide (SiO2) with various inclusions
Hardness: 6.5-7 (Mohs scale); Color: Green, white, brown, cream with orbicular or banding patterns; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Green, white, brown, cream with orbicular or banding patterns; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic rock (rhyolite) cavities. This variety is characterized by its orbicular (eye-like) patterns and is found in the Marovato region of Madagascar, specifically in intertidal zones.
Uses & applications
Predominantly used for ornamental purposes, lapidary arts, jewelry (cabochons), and as a collector's specimen due to its unique patterns.
Geological facts
Ocean Jasper is technically a trade name for a spherulitic rhyolite. It is only found on the coast of Madagascar and can sometimes only be mined during low tide, hence the name 'Ocean' jasper.
Field identification & locations
Identify by its distinctive circular 'orbettes' or wavy flow-banding patterns. It is often polished into towers or spheres to display the interior patterns. In the field, it is extremely rare and localized to specific coastal Madagascar sites.
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