Dolomite

Dolomite is also known as Calcium Magnesium Carbonate or Raw Limestone. It is a ceramic material is a uniform calcium magnesium carbonate. In ceramic glazes it is used as a source of magnesia and calcia. Other than talc, dolomite is the principle source of MgO in high temperature raw glazes. 'Dolomite matte' stoneware glazes, for example, are highly prized for their silky surface texture.