mineral

Ocean Jasper

Orbicular Jasper (Silicon Dioxide with impurities), SiO2

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs), Color: Cream, green, brown, and yellow with orbicular (eye-like) patterns, Luster: Vitreous to dull, Crystal Structure: Trigonal (Cryptocrystalline), Cleavage: None

Hardness: 6

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs), Color: Cream, green, brown, and yellow with orbicular (eye-like) patterns, Luster: Vitreous to dull, Crystal Structure: Trigonal (Cryptocrystalline), Cleavage: None

Formation & geological history

Formed through the silicification of volcanic ash or rhyolite flows, where radial structures of quartz and feldspar grow in a spherulitic pattern. This specific variety is unique to the coast of Madagascar.

Uses & applications

Primarily used as a lapidary material for decorative carvings, polished points, jewelry, and as a highly collectible specimen for mineral enthusiasts.

Geological facts

Ocean Jasper can only be mined during low tide along the coast of Madagascar. The original deposit (Mine 1) was completely exhausted by 2006, making authentic older specimens more valuable.

Field identification & locations

Identify by the presence of 'orbs' or circles within the stone. In the field, look for multi-colored nodules in volcanic host rock. It is almost exclusively found in the Analalava district of Madagascar.