mineral

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Hardness: 6.5-7 (Mohs); Color: Multi-colored (green, yellow, brown, white) with circular patterns; Luster: Vitreous to waxy; Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.65

Hardness: 6
Luster: Vitreous to waxy

Identified June 19, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic rhyolite as it cools, creating orbicular (circular) mineral patterns. Most notable deposits are from the Cretaceous era in Madagascar.

Uses & applications

Primarily used in jewelry, lapidary arts, spiritual practices/metaphysical collecting, and as decorative cabochons or polished display pieces.

Geological facts

Ocean Jasper is only found during low tide on the coast of Madagascar. The primary veins were exhausted in the mid-2000s, making authentic 'old stock' specimens highly sought after by collectors.

Field identification & locations

Identify in the field by its unique 'orbicular' or 'poppy-like' circular patterns and high silicate hardness. Found specifically along the Marovato coastline of Madagascar.