sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide - SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Multicolored (red, pink, cream, green), Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Multicolored (red, pink, cream, green), Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
Formation & geological history
Formed through the precipitation of silica from hot springs and volcanic activity where layers of rhyolite are replaced by chalcedony. This specific material is found in the sediment of tidal zones and is believed to be millions of years old.
Uses & applications
Ornamental carvings, jewelry, lapidary art, and metaphysical collecting.
Geological facts
Ocean Jasper is technically a trade name for orbicular jasper found only on the coast of Madagascar. It is called 'Ocean' Jasper because the original deposits were only accessible by boat at low tide.
Field identification & locations
Identify by its distinctive orbicular (circular) patterns and translucent to opaque areas. It is found exclusively along the northwestern coast of Madagascar (Analalava district).
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