mineral

Ocean Jasper

SiO2 (Silicon Dioxide with impurities)

Hardness: 6.5-7, Color: Multicolored (brown, white, grey in this specimen) with orbicular patterns, Luster: Vitreous when polished, Crystal structure: Microcrystalline (chalcedony), Cleavage: None

Hardness: 6

Identified July 16, 2026More mineral →

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Physical properties

Hardness: 6.5-7, Color: Multicolored (brown, white, grey in this specimen) with orbicular patterns, Luster: Vitreous when polished, Crystal structure: Microcrystalline (chalcedony), Cleavage: None

Formation & geological history

Formed from silicified rhyolite or tuff. Unique to northwestern Madagascar. Formation process involves the precipitation of silica from hydrothermal fluids.

Uses & applications

Commonly used in lapidary arts, jewelry making (cabochons, pendants like the one shown), and as a collector's stone due to its unique patterns.

Geological facts

True Ocean Jasper is only found in a few specific locations in Madagascar, some of which are only accessible at low tide, hence the name. It is known for its distinctive spherical or 'orbicular' patterns.

Field identification & locations

Identify by the presence of circular, orbicular patterns in various colors within a chalcedony/Jasper base. Distinctive from other jaspers due to these prominent eyes or orbs. Found exclusively in Madagascar.