mineral

Polished ocean jasper (orbicular jasper), likely a small tumbled stone

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Typically Mohs 6.5–7; opaque, polished, and waxy to vitreous. The specimen appears blue-green with a pale cream band and brownish edge; its precise variety cannot be confirmed from the image.

Identified September 25, 2026More mineral →

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Physical properties

Typically Mohs 6.5–7; opaque, polished, and waxy to vitreous. The specimen appears blue-green with a pale cream band and brownish edge; its precise variety cannot be confirmed from the image.

Formation & geological history

Silica-rich fluids deposited chalcedony in volcanic cavities, with later mineral growth producing color bands and patterns. Classic ocean jasper formed in rhyolitic volcanic rocks on Madagascar, mainly during the Cenozoic.

Uses & applications

Used for cabochons, beads, small carvings, and collecting; this small polished piece is primarily decorative.

Geological facts

“Ocean jasper” is a trade name for orbicular patterned chalcedony, not a single formally defined mineral species.

Field identification & locations

Identify by its opaque, fine-grained body, polished surface, and distinctive rounded or banded patterns; the visible banding is suggestive but not diagnostic. Madagascar is the best-known source; check for natural-looking patterns and a cool, stone-like feel.