mineral

Polished ocean jasper (orbicular jasper), possibly rhyolite jasper

Microcrystalline quartz (SiO₂) with iron oxides and altered volcanic minerals

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque, multicolored orange, green, gray, and cream; vitreous to waxy luster; no visible cleavage; fine-grained silica-rich structure. The rounded form is polished/tumbled.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms from silica-rich volcanic rocks, where chalcedony and quartz replace or fill cavities and fractures, often producing orbicular patterns; commonly Cenozoic in age. The exact locality cannot be confirmed from the image.

Uses & applications

Used for cabochons, beads, carvings, and decorative polished specimens; occasionally used for small ornamental objects. Common polished pieces typically have modest collector value.

Geological facts

The green coloration may result from chlorite, celadonite, or other altered volcanic minerals, while orange areas commonly reflect iron oxides. “Ocean jasper” is a lapidary trade name rather than a single precisely defined mineral species.

Field identification & locations

Identify by its opaque, vividly patterned, silica-hard body and ability to take a strong polish; it should resist scratching by a steel blade but be scratched by quartz. Similar-looking dyed stones and other jaspers are common.