mineral

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with various inclusions

Hardness: 6.5-7 (Mohs scale); Color: Multi-colored with greens, browns, and cream; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); SG: 2.6-2.9

Hardness: 6
Color: Multi-colored with greens, browns, and cream
Luster: Vitreous to waxy

Identified June 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a rhyolite or tuff through the slow precipitation of silica from hot water within volcanic rock cavities. It is specifically associated with the Marovato region of Madagascar and is found in the intertidal zones.

Uses & applications

Primary use is in jewelry, lapidary arts, and as a collector's specimen. It is also popular in holistic practices and home decor due to its unique aesthetic patterns.

Geological facts

Ocean Jasper is only found in one place in the world: the coast of Madagascar. True 'Old Stock' Ocean Jasper is becoming rare because the original veins can only be reached by boat during low tide and many have been exhausted.

Field identification & locations

Identify by its characteristic 'orbs' or circular patterns and bands of color. It is often found as smooth, water-worn pebbles or in veins at the edge of the ocean. Collectors look for high contrast, translucency, and distinct orb patterns.

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