Skjell

Skjell is a Norwegian term meaning shell, particularly the hard outer covering produced by mollusks such as clams, mussels, oysters, and snails. In everyday language it refers to shells found on beaches as well as to shells in a biological sense.

In biology and malacology, skjell are studied for their morphology, growth patterns, and mineral composition. Most shells are made of calcium carbonate secreted by the mantle and often show layered structures, such as nacre (mother of pearl) and an outer prismatic layer, which contribute to strength, shape, and color.

Ecology and use: Shells serve as protective coverings for the animal and, after death, as habitats for various small organisms. They accumulate on shorelines and are commonly collected for decoration, jewelry, or crafts. Shellfish harvesting is a significant activity in many coastal regions, and practices are governed by regulations aimed at sustainable management and the protection of vulnerable species and habitats.

Conservation and trade: Some shells come from endangered or protected species, and unsustainable collection can threaten populations and ecosystem balance. Trade in shells is often regulated at national and international levels to prevent overexploitation and illegal trafficking.

Etymology and related terms: The word skjell traces to Proto-Germanic roots and has cognates in related North European languages, reflecting a shared linguistic heritage. See also mollusks, seashell, bivalvia, and gastropoda.