THE calcium carbonate of mollusc shells occurs as calcite in some species, as aragonite in others, and certain species deposit calcite in one portion of the shell and aragonite in another portion.

However, another type of mollusk called limpets are not. While oysters are a highly sought-after food ... Their bodies are covered by large, hard shells, and many species are known for being ...

plus the many types to try. Related: How to Clean All Kinds of Clams, Mussels, and Oysters Clams and mussels are bivalve mollusks, or aquatic animals that have a two-part shell covering a soft body.