mineral

Orbicular Jasper (Ocean Jasper)

Silicon Dioxide (SiO2) with iron and magnesium inclusions

Hardness: 6.5-7.0 (Mohs). Color: Multicolored (tan, brown, black). Luster: Vitreous to waxy. Structure: Microcrystalline quartz (Trigonal). Cleavage: None; conchoidal fracture. Specific Gravity: 2.6-2.9.

Hardness: 6
Color: Multicolored (tan, brown, black)
Luster: Vitreous to waxy

Identified January 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids precipitate into cavities in volcanic rocks. The circular 'eyes' or orbs are caused by radial growth of needle-like crystals around a central nucleus. Often linked to ancient volcanic activity.

Uses & applications

Primarily used as a semi-precious gemstone for jewelry, lapidary cabochons, and decorative ornamental carvings. Highly valued by mineral collectors for its unique patterns.

Geological facts

Ocean Jasper is specifically found along the coast of Madagascar and can sometimes only be harvested at low tide. This specimen shows 'orbicular' patterns which are unique spheres of mineral growth within the matrix.

Field identification & locations

Identify in the field by its distinct circular eye-like patterns and high hardness (cannot be scratched by a steel pocket knife). Commonly found in Madagascar, Oregon, and Washington state. Look for banded or circular textures on a weathered surface.

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