Mollusk shell-Mollusk shell is actually a calcareous exoskeleton, which encloses and protects the soft part of the animal in the phylum Mollusca. This includes animals such as snails, clams, tusk shells and several other animals, however not all the shelled animals live in sea. There are some mollusk shell found in fresh water too. A mollusk shell is made, repaired and maintained by a portion of anatomy known as mantle. Natural pearl is found in Bahrain and Australia. Colored pearls are available in Philippines and Indonesia.