mineral
Orbicular Jasper (Ocean Jasper)
Silicon Dioxide (SiO2) with mineral inclusions
AI-generated identification · may be incorrectHardness 6.5-7 on Mohs scale; waxy to vitreous luster (glossy when polished); microcrystalline quartz structure; colors range across earthy yellows, greens, browns, and reds with concentric circular or orb-like patterns; specific gravity approx. 2.6.
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Physical properties
Hardness 6.5-7 on Mohs scale; waxy to vitreous luster (glossy when polished); microcrystalline quartz structure; colors range across earthy yellows, greens, browns, and reds with concentric circular or orb-like patterns; specific gravity approx. 2.6.
Formation & geological history
Formed in hydrothermal environments as silica-rich fluids precipitated within cavities or voids of altered volcanic rhyolite, often involving spherulitic crystallization during the cooling of volcanic lava.
Uses & applications
Predominantly used for lapidary work, cabochons, polished decorative display stones, palm stones, and metaphysical jewelry.
Geological facts
Ocean Jasper specifically hails from the coastal region of northwestern Madagascar near Marovato and can only be mined at low tide by boat. The orbicular patterns are formed by radiating radial fibers of quartz or feldspar.
Field identification & locations
Identified by its distinctive spherical 'eyes' or concentric orbs mixed with chalcedony and jasper matrix. Found principally in Madagascar, with similar orbicular jaspers found in Mexico and the United States (Morgan Hill Poppy Jasper).
