mineral
Polished ocean jasper (orbicular jasper), probable
Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions
AI-generated identification · may be incorrectTypically Mohs hardness 6.5–7, opaque, with a glassy-to-waxy luster and irregular conchoidal fracture; this small polished piece shows pale green-gray and salmon-red mottling. Exact identification is limited by the blurred image and lack of tests.
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Physical properties
Typically Mohs hardness 6.5–7, opaque, with a glassy-to-waxy luster and irregular conchoidal fracture; this small polished piece shows pale green-gray and salmon-red mottling. Exact identification is limited by the blurred image and lack of tests.
Formation & geological history
Forms when silica-rich fluids replace or fill cavities in volcanic rocks, preserving orbicular or brecciated patterns; many commercial ocean jasper specimens formed in late Cenozoic volcanic settings near Madagascar.
Uses & applications
Used for cabochons, carvings, beads, tumbled stones, and decorative objects; generally a modest-value lapidary material.
Geological facts
Red coloration commonly comes from hematite or related iron oxides, while green areas may reflect chlorite or other altered silicates; “ocean jasper” is a trade name rather than a single formally defined mineral species.
Field identification & locations
Look for opaque, patterned chalcedony that scratches glass but not readily with a steel blade; ceramic streak, acid, and locality information help distinguish it from dyed stone or resin. Commonly found in Madagascar, Mexico, Brazil, India, and Australia.
