mineral

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) - Variety of Chalcedony/Quartz

Hardness: 6.5-7 (Mohs). Color: Highly varied (greens, browns, creams, pinks, yellows). Luster: Vitreous to waxy. Structure: Microcrystalline (trigonal). Cleavage: None. Specific Gravity: 2.6 - 2.8.

Hardness: 6
Color: Highly varied (greens, browns, creams, pinks, yellows)
Luster: Vitreous to waxy

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs). Color: Highly varied (greens, browns, creams, pinks, yellows). Luster: Vitreous to waxy. Structure: Microcrystalline (trigonal). Cleavage: None. Specific Gravity: 2.6 - 2.8.

Formation & geological history

Formed through the rhyolitic volcanic process where silica-rich fluids permeate volcanic rocks. Most authentic specimens originate from the Cretaceous period (about 66-145 million years ago) in the beach deposits of Madagascar.

Uses & applications

Primarily used for lapidary work, jewelry, ornamental carvings, and a highly popular specimen for rock and crystal collectors due to its unique patterns.

Geological facts

This specific variety is only found on the coast of Madagascar. It was originally discovered in the 1950s but the location was lost for 45 years until rediscovery in 1999. It is often called Ocean Jasper because the original veins could only be reached by boat during low tide.

Field identification & locations

Identify in the field by its unique 'orbicular' (eye-like) patterns and wavy bands of color. It is nearly always found in Madagascar; collectors should look for smooth, polished surfaces that reveal the internal 'flowers' or circular inclusions.

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