mineral

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with iron and magnesium inclusions

Hardness: 6.5-7 (Mohs), Color: Multicolored with circular/orbicular patterns (green, brown, pink, white), Luster: Vitreous to waxy, Crystal Structure: Hexagonal/Trigonal (Cryptocrystalline), Cleavage: None, Specific Gravity: 2.6-2.9

Hardness: 6

Identified May 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich hydrothermal fluids in the cavities of volcanic rocks (rhyolite). These specific orbicular structures are caused by the radial growth of fibrous chalcedony and quartz.

Uses & applications

Used primarily in lapidary arts for jewelry, cabochons, decorative carvings, and as a popular specimen for mineral collectors due to its unique patterns.

Geological facts

Ocean Jasper is exceptionally rare because it is found only in one location: along the coast of Marovato in Madagascar. The original deposit could only be accessed and mined at low tide by boat.

Field identification & locations

Identify by its distinctive 'eyes' or orb-like patterns and wide range of opaque colors. In the field, look for nodules within weathered volcanic host rock. It is a favorite among collectors for its aesthetic variety.

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