mineral

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 Mohs; Color: Dark green with lighter green/white orbicular patterns; Luster: Vitreous to waxy; Crystal structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.9

Hardness: 6
Color: Dark green with lighter green/white orbicular patterns
Luster: Vitreous to waxy

Identified May 10, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the accumulation of silica-rich volcanic ash and fluids in coastal environments. The orbicular or 'circular' patterns are formed by the precipitation of chalcedony around a central nucleus within rhyolitic rocks.

Uses & applications

Primarily used for ornamental carvings, jewelry (cabochons), and as a popular specimen for metaphysical and mineral collectors.

Geological facts

Ocean Jasper is exceptionally rare as it is only found along the coast of Madagascar. It can only be mined during low tide, making the extraction process difficult and time-sensitive.

Field identification & locations

Identify by characteristic circular or 'eye' patterns and vugs (small cavities filled with quartz crystals). It is found primarily in north-western Madagascar, specifically in the Marovato area.

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