mineral

Ocean Jasper (Orbicular Jasper)

Spherulitic Chalcedony/Rhyolite (SiO2)

Hardness: 6.5 - 7; Color: Multi-colored with green, white, pink, and tan; Luster: Vitreous to waxy; Structure: Cryptocrystalline with spherulitic (orbicular) inclusions; Cleavage: None (conchoidal fracture).

Hardness: 6
Color: Multi-colored with green, white, pink, and tan
Luster: Vitreous to waxy

Identified March 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed from hydrothermal precipitation of silica-rich fluids within volcanic rhyolite flows. The distinct circular patterns or 'orbs' are formed by the radial crystallization of needle-like quartz or feldspar. Primarily from the Cretaceous period.

Uses & applications

Used extensively in jewelry for lapidary work, cabochons, and decorative carvings. It is a highly sought-after collectible mineral for its unique aesthetic patterns.

Geological facts

Ocean Jasper is exceptionally rare because it is only found along the coast of Madagascar. The original deposits could originally only be reached by boat and mined during low tide. It is technically more of a chalcedony than a true jasper.

Field identification & locations

Identify by its unique 'eyes' or circular orbicular patterns embedded in a solid matrix. Commonly found near Marovato, Madagascar. Collectors should look for vibrant contrast and high density of orbs.

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