mineral

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 (Mohs scale); Color: green, yellow, white, pink, and brown with concentric circular patterns; Luster: vitreous to waxy; Crystal structure: microcrystalline trigonal; Cleavage: none.

Hardness: 6
Luster: vitreous to waxy

Identified April 29, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: green, yellow, white, pink, and brown with concentric circular patterns; Luster: vitreous to waxy; Crystal structure: microcrystalline trigonal; Cleavage: none.

Formation & geological history

Formed from rhyolitic volcanic flows where silica-rich fluids precipitated in pockets, creating orbicular (circular) patterns. Typical specimens are found in the Marovato area of Madagascar.

Uses & applications

Mostly used for ornamental carvings, cabochons for jewelry, and as highly sought-after lapidary display specimens for collectors.

Geological facts

True Ocean Jasper is technically only found at a single location in Madagascar that can often only be accessed during low tide by boat, making it a rare variety of chalcedony.

Field identification & locations

Identify by the presence of 'eyes' or colorful orb-like structures within a translucent to opaque quartz base. It is frequently found as beach-worn stones in its primary locality.

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Mineral/Rock

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Metamorphic Rock

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mineral