What is another word for calcium carbonate?
Pronunciation: [kˈalsi͡əm kˈɑːbənˌe͡ɪt] (IPA) 
Calcium carbonate is a ubiquitous mineral, found in rocks, shells, and even in our own bodies. It is also known by various other names, including chalk, limestone, and marble. Chalk refers to a soft, porous type of calcium carbonate, commonly used in classrooms as a writing surface. Limestone is a hard, sedimentary rock comprised mainly of calcium carbonate. Marble is a metamorphic rock formed by the recrystallization of limestone, often used in construction and sculpture. Other synonyms for calcium carbonate include aragonite, travertine, and calcite. All of these synonyms refer to the same chemical compound, consisting of one calcium ion bonded to one carbonate ion.
