Minerals (Category A)
Limestone / Dolomite
Limestone is a sedimentary rock composed of calcium carbonate (CaCO3). Most is formed by the accumulation and subsequent solidification of marine fossil debris, but freshwater limestone deposits are also known. Marble formed by the metamorphism of limestone is an important source of calcium carbonate in South Australia, as is shellgrit, an unconsolidated accumulation of sea shell debris found in beach ridge deposits along the coastline. Metamorphism of the limestone will recrystallize it as marble but generally this does not effect its capacity as an industrial material.
Dolomite (pronunciation: /ˈdɒləmaɪt/) is an anhydrous carbonate mineral composed of calcium magnesium carbonate, ideally CaMg(CO3)2. The word dolomite is also used to describe the sedimentary carbonate rock, which is composed predominantly of the mineral dolomite (also known as dolostone).