mineral

Ocean Jasper

SiO2 (Silicon Dioxide) - Chalcedony variety

Hardness: 6.5-7 on Mohs scale. Color: Highly variable, often featuring spherical (orbicular) patterns in shades of pink, green, white, yellow, and brown. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline). Cleavage: None. Specific gravity: 2.58-2.64.

Hardness: 6
Luster: Vitreous to waxy

Identified June 18, 2026More mineral →

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Physical properties

Formation & geological history

Ocean Jasper is an orbicular chalcedony or jasper that formed as a rhyolitic igneous rock. The orbicular patterns are the result of quartz and feldspar crystallizing in radial aggregates. It is found exclusively in northwestern Madagascar.

Uses & applications

Primarily used as a lapidary material for cabochons, carvings, and ornamental objects. Highly valued by collectors for its unique patterns and colors.

Geological facts

Ocean Jasper is also known as orbicular jasper. It is called 'Ocean Jasper' because the original deposits were only accessible at low tide along the coast of Madagascar. The specific mine has since been largely depleted.

Field identification & locations

Identified by its distinctive spherical or orbicular patterns, often resembling 'eyes' or flowers, and its wide array of colors within a single specimen. It takes an excellent polish. Due to its limited geological occurrence, authentic Ocean Jasper from Madagascar is highly sought after.

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