chank

Chank refers to a large marine gastropod mollusk, specifically species within the family Turbinidae. These are commonly known as turban snails. Chanks are characterized by their thick, heavy, and spirally coiled shells, which are often ornate with knobs, spines, or ridges. The shell aperture is typically large and round, and the operculum, a hardened plate that seals the shell opening, is often circular and concave.

These marine snails are found in tropical and subtropical waters worldwide, inhabiting a variety of marine environments, including coral reefs, rocky shores, and sandy seabeds. They are herbivores, feeding primarily on algae. The shells of chanks have been used for centuries in various cultural and economic contexts. In some cultures, they are considered sacred and are used in religious ceremonies or as decorative items. Historically, they have also been utilized as a source of lime, for jewelry, and even as currency. The term "chank" is particularly associated with the shells of the species Xancus pyrum, which are historically significant in Indian culture and trade.