mineral
Polished Ocean Jasper (orbicular jasper)
Microcrystalline quartz (SiO₂) with chalcedony, feldspar, and iron-oxide inclusions
AI-generated identification · may be incorrectTypically hardness 6.5–7 Mohs, opaque to slightly translucent, waxy to vitreous luster, and multicolored orbicular or brecciated patterns. The yellow-brown coloration comes mainly from iron oxides; it has no prominent cleavage.
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Physical properties
Typically hardness 6.5–7 Mohs, opaque to slightly translucent, waxy to vitreous luster, and multicolored orbicular or brecciated patterns. The yellow-brown coloration comes mainly from iron oxides; it has no prominent cleavage.
Formation & geological history
Formed when silica-rich volcanic fluids filled cavities and fractures in volcanic rocks, producing concentric orbicular textures during mineralization. Most classic material comes from Ouanaminthe, Madagascar, generally associated with Mesozoic volcanic sequences.
Uses & applications
Commonly cut and polished into cabochons, hearts, beads, carvings, and decorative objects; it is valued primarily as a lapidary and ornamental stone rather than an industrial material.
Geological facts
“Ocean jasper” is a trade name, not a single formally defined mineral species; true orbicular material is comparatively collectible. Jasper is a chalcedony-rich variety of quartz containing abundant impurities and inclusions.
Field identification & locations
Identify it by its opaque polished surface, rounded orbicular markings, earthy yellow/gray colors, and quartz-like hardness; it should resist scratching by steel. Common sources include Madagascar, Mexico, Australia, and the western United States.
