Ocean Jasper

Hardness: 6.5-7 on the Mohs scale, Color: A wide range including green, brown, cream, white, pink, and red, often with orbicular patterns, Luster: Vitreous to waxy, Crystal Structure: Cryptocrystalline (microscopic quartz fibers), Specific Gravity: 2.58-2.61

Formed from silica-rich volcanic lava flows, specifically rhyolite flows over ancient sedimentary deposits. Geodes filled with silicic solutions formed nodular or orbicular patterns. Primarily found along the coastline of Madagascar, having been mined from only two specific locations. Its formation is linked to specific geological conditions in these coastal areas, often accessible only during low tide.

Predominantly used as a lapidary material for jewelry (beads, cabochons, carvings) and ornamental objects. Valued for its unique patterns and vibrant colors by collectors.

Ocean Jasper was only discovered relatively recently (late 1990s) in Madagascar, making it one of the newer gemstones on the market. Its distinctive orbicular or 'eye' patterns are what give it its name and unique appeal. The specific localities where it's found are now largely depleted, making genuine Ocean Jasper increasingly rare and valuable.

In the field, Ocean Jasper is identified by its varied colors and, most notably, its distinctive orbicular patterns which can range from small dots to larger, well-defined 'eyes.' These patterns are usually set against a contrasting background color. It's often found as nodules in volcanic rock formations. Collectors look for pieces with strong patterning, vibrant colors, and good polish. Currently, primary sources are in Madagascar near the ocean, sometimes even requiring boats to access at low tide.