mineral

Polished ocean jasper (orbicular jasper), likely

Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and other inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, olive, cream, and golden mottling with a waxy-to-glassy polished luster. Cryptocrystalline, massive, with no visible cleavage; specific gravity approximately 2.6.

Identified August 21, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids fill cavities and replace volcanic rock, commonly producing orbicular patterns; most classic material formed in Paleogene volcanic terrains. The exact locality cannot be confirmed from the photograph.

Uses & applications

Used as a lapidary stone for cabochons, tumbled stones, carvings, and decorative objects; generally inexpensive as jewelry material.

Geological facts

The specimen appears to be a polished jasper cabochon or tumble, but its rounded patterning could also indicate another jasper variety such as leopard jasper or rhyolite.

Field identification & locations

Identify by its opaque cryptocrystalline texture, hardness, lack of cleavage, and resistance to scratching by steel; it should not fizz in dilute acid. Common sources include Madagascar, Mexico, Oregon, Utah, and India.