Rock Identifier
Cat's Eye Shell (Shiva Shell) (Operculum of the Turbo petholatus (Tapestry Turban Snail), predominantly Calcium Carbonate (Aragonite)) — mineraloid / biogenic specimen
mineraloid / biogenic specimen

Cat's Eye Shell (Shiva Shell)

Operculum of the Turbo petholatus (Tapestry Turban Snail), predominantly Calcium Carbonate (Aragonite)

Hardness: 3.5-4.0 (Mohs scale); Color: White to cream with a distinct brown, orange, or green spiral; Luster: Pearly to vitreous; Structure: Spiral/coiled growth pattern; Cleavage: None (conchoidal fracture); Specific Gravity: ~2.7-2.9

Hardness
3
Luster
Pearly to vitreous
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Physical properties

Hardness: 3.5-4.0 (Mohs scale); Color: White to cream with a distinct brown, orange, or green spiral; Luster: Pearly to vitreous; Structure: Spiral/coiled growth pattern; Cleavage: None (conchoidal fracture); Specific Gravity: ~2.7-2.9

Formation & geological history

Formed as a protective 'trapdoor' or operculum for the Tapestry Turban snail (Turbo petholatus). It is a biogenic structure created by the snail secreting calcium carbonate layers over months to years. Commonly found in Indo-Pacific tropical waters.

Uses & applications

Primarily used in jewelry (pendants, rings), as pocket stones for 'good luck' in various cultures, and as collector specimens for beachcombers and conchologists.

Geological facts

In Hinduism, the spiral represents the third eye of the God Shiva; hence it is widely known as a 'Shiva Eye'. It is naturally shed when the snail dies or grows, often washing up on beaches after monsoons or high tides.

Field identification & locations

Identify by its unique spiral pattern on one side and a flat, often pearly white surface on the reverse. Found on tropical beaches in Thailand, Australia, and Indonesia. Collectors look for high symmetry in the spiral and lack of beach erosion.

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