Mineral
Ocean Jasper
Orbicular Jasper / Chalcedony (SiO2)
Hardness of 6.5-7 on the Mohs scale. Colors vary widely, this specimen is predominantly white, cream, and pale grayish-blue with small brown/tan inclusions. Waxy to dull luster. Cryptocrystalline structure. No cleavage. Specific gravity of 2.58-2.64.
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Physical properties
Hardness of 6.5-7 on the Mohs scale. Colors vary widely, this specimen is predominantly white, cream, and pale grayish-blue with small brown/tan inclusions. Waxy to dull luster. Cryptocrystalline structure. No cleavage. Specific gravity of 2.58-2.64.
Formation & geological history
Formed from the precipitation of silica-rich waters in cavities of volcanic rock. The orbicular patterns are formed by spherulitic growth of chalcedony. specifically ocean jasper is unique to the northwestern coast of Madagascar.
Uses & applications
Primarily used as a lapidary material for cabochons, pendants, beads, and carvings due to its striking patterns. Collector's mineral.
Geological facts
Ocean Jasper is a trademarked name for a specific type of orbicular jasper found only in a small area on the coast of Madagascar, which can only be mined at low tide.
Field identification & locations
Identify by its distinctive circular, orb-like patterns (eyes). It is relatively hard and takes a good polish. It is exclusively found in Madagascar.
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