What physical properties of seashells?

Seashells exhibit several notable physical properties, including hardness, which protects the organisms inside from predators and environmental conditions. Their structure is primarily composed of calcium carbonate, giving them a distinctive rigidity and a variety of shapes and sizes. Additionally, seashells often display intricate patterns and colors, which can serve as camouflage or attract mates. The smooth, glossy surface of many shells also aids in reducing friction as they move through water.