mineral

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Hardness: 6.5-7 (Mohs scale), Color: Multicolored (greens, yellows, creams, browns), Luster: Vitreous to waxy when polished, Crystal structure: Trigonal/Microcrystalline, Cleavage: None, Fracture: Conchoidal.

Hardness: 6

Identified May 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich fluids precipitating in voids of volcanic rhyolite. It is highly localized, found only in the coastal regions of Marovato in northwestern Madagascar, created during the Cretaceous period.

Uses & applications

Primarily used for ornamental lapidary work including polished spheres, cabochons for jewelry, and as a highly sought-after collector\'s specimen due to its unique patterns.

Geological facts

Ocean Jasper is technically a trade name for a variety of Orbicular Jasper. It is called \'Ocean Jasper\' because the original veins were only accessible by boat at low tide.

Field identification & locations

Identify by its distinctive orbicular (eye-like) circular patterns and multicolored wavy bands. It is most commonly found in Madagascar. For collectors, the presence of distinct \'orbs\' and vibrant colors increases value.