Ocean Jasper

Physical Properties

Hardness: 6.5–7 on Mohs scale; Color: Multi-colored (green, white, yellow, cream) with orbicular patterns; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (microcrystalline/cryptocrystalline trigonal); Cleavage: None; Specific Gravity: 2.58–2.91

Formation & Geological History

Formed through the accumulation of volcanic ash and minerals in the hydrothermal veins of silica-rich rhyolite. The 'orbs' or circles are spherulitic growths resulting from radial crystallization of needle-like crystals of quartz or feldspar. Primarily sourced from the Marovato coastline of Madagascar.

Uses & Applications

Used primarily in lapidary arts for cabochons, jewelry, carvings, and as a highly sought-after decorative specimen for collectors.

Geological Facts

This specific variety is called 'Ocean Jasper' because the original deposits were found along the coastline and could only be harvested during low tide by boat. The original vein (Kabamby and Marovato) is considered mostly depleted, making high-quality older stock more valuable.

Field Identification & Locations

Identify by its unique 'orbicular' or circular patterns and botryoidal formations. It is unique to Madagascar. Collectors should look for vibrant colors and well-defined circles with minimal pitting.

Identified on: 4/18/2026

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