mineral

Ocean Jasper

Orbicular Jasper (variety of Chalcedony)

Hardness: 6.5-7. Color: Multi-colored, often featuring reds, greens, yellows, and whites. Luster: Vitreous. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.91.

Hardness: 6
Luster: Vitreous

Identified June 17, 2026More mineral →

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Physical properties

Hardness: 6.5-7. Color: Multi-colored, often featuring reds, greens, yellows, and whites. Luster: Vitreous. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.91.

Formation & geological history

Formed in highly silicified rhyolite or tuff. Found primarily in Madagascar.

Uses & applications

Used primarily in lapidary arts for cabochons, carvings, and jewelry.

Geological facts

Known for its distinctive orbicular (spherical) patterns, Ocean Jasper is a trademarked name for this specific variety found exclusively in Madagascar.

Field identification & locations

Identify by its unique orbicular patterns and rich colors. Commonly found in coastal areas of northwestern Madagascar, though mining has become increasingly difficult.

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