Dolomitization is a natural phenomenon whereby calcium carbonate (CaCO3) is transformed into CaMg(CO3)2 or dolomite.
Seawater, which is naturally rich in magnesium (Mg), infuses the limestone with Mg. This reduces its calcium composition by up to 50 percent. To become dolomite, limestone must have gone through this exchange several times or over a long and stable period.
About one-fifth of Lhoist’s reserves are comprised of dolomite.
Dolime, produced from the calcination of dolomite, is used for the production of glass, in the steel and agriculture industries, as well as in refractory production.