mineral

Shiva Eye Shell (Operculum)

Calcium Carbonate (Aragonite), CaCO3

Hardness: 3.5-4.0; Color: White to cream base with a dark brown or green spiral; Luster: Pearly to vitreous; Crystal structure: Orthorhombic; Specific gravity: 2.7-2.9.

Hardness: 3
Color: White to cream base with a dark brown or green spiral
Luster: Pearly to vitreous

Identified May 18, 2026More mineral →

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Physical properties

Hardness: 3.5-4.0; Color: White to cream base with a dark brown or green spiral; Luster: Pearly to vitreous; Crystal structure: Orthorhombic; Specific gravity: 2.7-2.9.

Formation & geological history

Biogenic mineral formation. It is the protective trapdoor (operculum) of the Turbo castanea snail. It forms as the snail grows through the secretion of calcium carbonate layers, typically in shallow tropical marine environments.

Uses & applications

Primarily used in jewelry (pendants, rings, earrings), spiritual amulets, and as collector specimens.

Geological facts

The spiral on the operculum is said to represent the 'Third Eye' of the Hindu God Shiva. On one side it is a beautiful spiral, while the other side is typically pearly white.

Field identification & locations

Identify by its unique flat-domed shape and distinct spiral pattern. Commonly found on beaches in Southeast Asia, Thailand, and Australia. Collectors look for well-defined spirals and smooth, polished surfaces.

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