gemstone
Ocean Jasper
Silicon dioxide (SiO2), variety chalcedony with spherulitic inclusions
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, waxy luster, microcrystalline quartz structure, and distinct orbicular or polka-dot patterns in varied colors.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, waxy luster, microcrystalline quartz structure, and distinct orbicular or polka-dot patterns in varied colors.
Formation & geological history
Forms within hydrothermal veins and cavities in rhyolitic volcanic lava flows, primarily found along coastal cliffs in Madagascar.
Uses & applications
Widely used for ornamental carvings, polished display pieces, lapidary arts, and gemstone jewelry.
Geological facts
Ocean jasper is mined exclusively in a remote coastal location in northwestern Madagascar that is only accessible at low tide by boat.
Field identification & locations
Easily identified by its characteristic multi-colored orbicular patterns embedded within a translucent chalcedony matrix. Highly sought after by mineral collectors.
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