mineral

Ocean Jasper

Orbicular Jasper, Chalcedony (SiO2)

Hardness: 6.5-7, Color: Multicolored, often with distinct orbicular (circular) patterns in shades of green, brown, tan, pink, white, and yellow, Luster: Vitreous, Crystal structure: Microcrystalline (Trigonal), Cleavage: None, Specific gravity: 2.58-2.91

Hardness: 6

Identified June 17, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a result of hydrothermal activity, commonly found in rhyolitic volcanic rocks where silica-rich fluids filled cavities and fractures, creating the characteristic orbicular patterns.

Uses & applications

Primarily used as a lapidary stone for crafting jewelry, beads, cabochons, and ornamental objects. Highly valued by collectors for its unique patterns.

Geological facts

Ocean Jasper is exclusively found along the northwest coast of Madagascar. The original deposit could only be mined at low tide, leading to its name.

Field identification & locations

Identify by its distinctive orbicular patterns and microcrystalline quartz hardness. The specific location in Madagascar is the key source, making it a highly sought-after material for collectors.