Ocean Jasper

Physical Properties

Hardness: 6.5-7 (Mohs scale); Color: green, yellow, white, pink, and brown with concentric circular patterns; Luster: vitreous to waxy; Crystal structure: microcrystalline trigonal; Cleavage: none.

Formation & Geological History

Formed from rhyolitic volcanic flows where silica-rich fluids precipitated in pockets, creating orbicular (circular) patterns. Typical specimens are found in the Marovato area of Madagascar.

Uses & Applications

Mostly used for ornamental carvings, cabochons for jewelry, and as highly sought-after lapidary display specimens for collectors.

Geological Facts

True Ocean Jasper is technically only found at a single location in Madagascar that can often only be accessed during low tide by boat, making it a rare variety of chalcedony.

Field Identification & Locations

Identify by the presence of 'eyes' or colorful orb-like structures within a translucent to opaque quartz base. It is frequently found as beach-worn stones in its primary locality.

Identified on: 4/29/2026

Mode: Standard