mineral

Ocean Jasper

SiO2, highly silicified rhyolite or spherulitic chalcedony

Hardness of 6.5-7 on the Mohs scale. Colors include green, white, pink, yellow, and brown, often with spherical or orbicular patterns. Luster is vitreous to waxy. It is microcrystalline.

Identified June 17, 2026More mineral →

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Physical properties

Hardness of 6.5-7 on the Mohs scale. Colors include green, white, pink, yellow, and brown, often with spherical or orbicular patterns. Luster is vitreous to waxy. It is microcrystalline.

Formation & geological history

Formed as a highly silicified rhyolite or chalcedony with spherulitic patterns. Found exclusively in northwestern Madagascar, often mined along the coastline at low tide.

Uses & applications

Used primarily in lapidary arts for cabochons, carvings, beads, and ornamental objects. Popular among collectors.

Geological facts

Ocean jasper was lost for many years after its initial discovery in the early 20th century. It was rediscovered in the late 1990s. The spherical patterns are thought to be formed by quartz and feldspar crystallizing in radiating patterns.

Field identification & locations

Identified by its distinctive orbicular patterns and variety of colors. Found only in Madagascar. Collectors should look for distinct, well-defined orbs and good color contrast.

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