sedimentary

Ocean Jasper

Orbicular Jasper (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Polychromatic with white, green, grey, and black orbicular patterns; Luster: Vitreous to waxy when polished; Crystal Structure: Trigonal (Microcrystalline); Specific Gravity: 2.6-2.9

Hardness: 6
Luster: Vitreous to waxy when polished

Identified April 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed as a result of rhythmic precipitation of silica around a nucleus during volcanic activity, typically found in late cretaceous deposits. This specific variety is mined only from the coast of Madagascar.

Uses & applications

Primarily used for ornamental purposes, lapidary art, crystal healing, and as a collector's specimen due to its unique patterns.

Geological facts

Ocean jasper is unique because it can only be harvested at low tide. This specific skull carving showcases the 'orbicular' or 'spherical' patterns characteristic of high-quality Madagascar jasper.

Field identification & locations

Identify by the distinctive circular 'eyes' or dots within the matrix. It is found along the shoreline of Madagascar. Collectors should look for vibrant contrast and well-defined circles.