mineral

Ocean Jasper (Tumbled/Polished)

Silicon Dioxide (Microcrystalline Quartz) - SiO2

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Earthy tones of tan, brown, and cream with orbicular (circular) patterns; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None/Conchoidal fracture.

Hardness: 6
Luster: Vitreous to waxy

Identified July 6, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Earthy tones of tan, brown, and cream with orbicular (circular) patterns; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None/Conchoidal fracture.

Formation & geological history

Formed through the accumulation of volcanic ash and silica-rich fluids that solidify into rhyolite or chalcedony. The orbicular patterns are the result of radial growth of needle-like quartz and feldspar crystals.

Uses & applications

Used primarily in lapidary arts, jewelry making (cabochons), interior decoration, and as a popular specimen for metaphysical collectors.

Geological facts

This specific variety, often called 'Ocean Jasper', is famous for being found only on the coast of Madagascar. True Ocean Jasper veins are often only reachable by boat and can only be mined during low tide.

Field identification & locations

Identify by its distinctive 'eyes' or circular orb patterns and waxy surface when polished. Found naturally in Madagascar; collectors should look for vibrant color combinations and well-defined orbs.