mineral

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with various inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Multicolored with grey, green, and circular tan/pink orbicular patterns; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Fracture: Conchoidal.

Hardness: 6
Luster: Vitreous to waxy

Identified June 15, 2026More mineral →

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Physical properties

Formation & geological history

Ocean Jasper is a rare variety of jasper/chalcedony formed through the hydrothermal deposit of silica-rich fluids. This specific variety is found in shoreline deposits of the Marovato area in Madagascar, formed during the volcanic activity of the Mesozoic era.

Uses & applications

Primarily used for lapidary work, jewelry, ornamental carvings, and as a popular collector's mineral due to its unique patterns.

Geological facts

This stone is only found at the coast of Madagascar and can only be mined during low tide. Each vein is unique, meaning the patterns available change over time as the deposit is exhausted.

Field identification & locations

Identify by the presence of 'orbs' or flower-like circular patterns against a green or grey chalcedony background. It often has a smooth, river-rock texture when tumbled or water-worn.