mineral

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Hardness: 6.5-7 (Mohs); Color: Multicolored with concentric circles, swirls, or spots; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91

Hardness: 6
Color: Multicolored with concentric circles, swirls, or spots
Luster: Vitreous to waxy

Identified April 4, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a result of hydrothermal activity where silica-rich fluids precipitated in volcanic rock cavities (rhyolite), typically associated with ancient volcanic flows. Specifically found in the coastline of Madagascar.

Uses & applications

Primarily used for ornamental purposes, carvings, jewelry (cabochons), and as a popular specimen for metaphysical collectors.

Geological facts

Ocean Jasper is only found in the Marovato area of Madagascar. It is called 'Ocean' Jasper because the original veins were only accessible by boat at low tide.

Field identification & locations

Identify by its unique 'orbicular' (circular/bullet) patterns and varied colors (green, cream, red, yellow). Found mostly in Madagascar along the coast; look for the distinct nested orbs within a quartz or chalcedony matrix.