sedimentary

Ocean Jasper (Orbicular Jasper)

Spherulitic Chalcedony (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Variegated greens, creams, and whites with circular patterns; Luster: Vitreous to waxy; Crystal Structure: Cryptocrystalline; Specific Gravity: 2.6-2.7

Hardness: 6
Color: Variegated greens, creams, and whites with circular patterns
Luster: Vitreous to waxy

Identified June 14, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Variegated greens, creams, and whites with circular patterns; Luster: Vitreous to waxy; Crystal Structure: Cryptocrystalline; Specific Gravity: 2.6-2.7

Formation & geological history

Formed as a result of rhythmic precipitation of silica around a nucleus in volcanic environments, typically in shallow marine settings or through hydrothermal replacement of rhyolite. Primarily found in deposits dating to the Cenozoic or Mesozoic eras.

Uses & applications

Primarily used as a semi-precious gemstone for jewelry, lapidary work, cabochons, and as a popular specimen for crystal healing and mineral collecting.

Geological facts

Ocean Jasper was only found in one specific location in Madagascar and can only be mined during low tide. The original vein is considered largely exhausted, making high-quality specimens increasingly rare.

Field identification & locations

Identify by distinct 'orbicular' or eye-like circular patterns against a contrasting matrix. It is exclusively found along the coast of Northwest Madagascar. Collectors look for high contrast and clear orb definitions.