mineral

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with inclusions

Hardness: 6.5-7 (Mohs); Color: Multi-colored (yellow, white, green, brown) with characteristic circular patterns; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.6-2.7

Hardness: 6
Luster: Vitreous to waxy

Identified May 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a result of rhyolitic volcanic activity where silica-rich fluids cooled and crystallized in the presence of various mineral inclusions. This specific orbicular variety is found in Cretaceous-age coastal formations.

Uses & applications

Primarily used for ornamental purposes, including lapidary spheres, beads, jewelry, and as a highly sought-after display mineral for collectors.

Geological facts

Ocean Jasper is rare because it is only found along the coast of Madagascar. It can only be mined during low tide, earning its name because the source is originally underwater.

Field identification & locations

Identify by the presence of 'orbs' or eye-like circular patterns set within a chalcedony matrix. Look for distinct color zoning and a high polish. While found in Madagascar, collectors look for pieces with well-defined circles and vibrant color contrast.

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