mineral

Polished orbicular agate (likely ocean jasper)

Microcrystalline quartz, SiO₂; chalcedony with orbicular patterns and possible mineral inclusions

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent gray-green and cream with yellow-brown orbicules, waxy to vitreous polish, cryptocrystalline structure, no visible cleavage. The exact variety cannot be confirmed from the image alone.

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited in cavities or fractures, forming layered chalcedony and orbicular patterns over geological time. Ocean jasper is associated with volcanic rocks of Madagascar, commonly dated to the Cenozoic.

Uses & applications

Used for cabochons, beads, ornamental objects, and collecting; this polished egg-shaped piece is primarily decorative.

Geological facts

Agate is a banded or patterned variety of chalcedony; orbicular markings form eye-like rings and spots.

Field identification & locations

Look for hardness, waxy luster, and curved or concentric chalcedony patterns; ocean jasper is especially associated with Madagascar. Similar-looking orbicular agates occur elsewhere, so locality or testing is needed for a firm identification.