mineral

Polished Ocean Jasper

Orbicular jasper, microcrystalline quartz (SiO₂) with iron oxides and accessory minerals

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque gray-green, cream, rust-red, and brown zones with a glossy polish. It is cryptocrystalline, with no visible cleavage and conchoidal fracture; specific gravity is approximately 2.6.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids filled cavities and fractures in volcanic rock, producing orbicular and brecciated patterns; the material is generally Cenozoic in age. It is especially associated with coastal volcanic formations of Madagascar.

Uses & applications

Used for cabochons, carvings, polished display pieces, beads, and ornamental objects; it has little industrial value but strong decorative and collector appeal.

Geological facts

The distinctive circular “orb” patterns and colorful brecciation are diagnostic of ocean jasper, though many marketed examples are simply orbicular jasper or rhyolitic jasper.

Field identification & locations

Identify it by its opaque multicolor pattern, rounded orbicules, fine grain, and glassy polish; it should not fizz in dilute acid and should resist scratching by steel. Common sources include Madagascar, Mexico, Oregon, and Australia.