mineral

Polished orbicular jasper (likely ocean jasper)

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

AI-generated identification · may be incorrect

Mohs hardness about 6.5–7; polished, opaque surface with dark green-brown and white patches. The pattern is consistent with orbicular jasper, though an image alone cannot confirm the exact variety or mineral inclusions.

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited and replaced material in volcanic rocks, later forming patterned chalcedony; age and locality cannot be determined from the photo. Ocean jasper is associated especially with Madagascar.

Uses & applications

Used for lapidary spheres, cabochons, beads, and decorative objects; value depends on pattern, polish, and size.

Geological facts

Orbicular jasper’s rounded, contrasting patterns are often called “eyes” or “orbs.” The trade name ocean jasper is applied to distinctive orbicular material from Madagascar.

Field identification & locations

Look for opaque, fine-grained stone with rounded or irregular contrasting patterns and a glassy polish; hardness testing or locality information helps distinguish varieties. The pictured small polished sphere is consistent with jasper but not diagnostic of a specific source.