Mineral (Variety of Quartz/Chalcedony)
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with iron and magnesium inclusions
Hardness: 6.5-7 (Mohs scale), Color: Multicolored with concentric circles or 'eyes' in green, yellow, pink, and tan. Luster: Vitreous to waxy. Crystal Structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Multicolored with concentric circles or 'eyes' in green, yellow, pink, and tan. Luster: Vitreous to waxy. Crystal Structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None (conchoidal fracture).
Formation & geological history
Formed as a result of rhythmic precipitation of silica around a nucleus in volcanic environments, specifically within flows of rhyolite or tuff. The inclusions and 'orbs' form as the silica-rich magma cools over a long period. Often found in intertidal zones.
Uses & applications
Primarily used in jewelry (cabochons), ornamental carvings, and as a popular lapidary material for crystal collecting and holistic practices.
Geological facts
Genuine Ocean Jasper is only found along the coast of Madagascar. The original mine was only accessible during low tide, making it extremely difficult to excavate and eventually leading to its scarcity.
Field identification & locations
Identify by its unique 'orbicular' patterns and spherical inclusions. Field identification is usually local to Madagascar coastal deposits. Collectors look for high contrast, vibrant 'flowers' or orbs, and a lack of surface pits.
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