Magnesium is a fluorine
White crystals, density 3.037 g / cm³. At 500 ° C it is noticeable, and at 650 ° C it completely decomposes into MgO and CO2. The solubility of magnesium carbonate in water is insignificant (22 mg / l at 25 ° C) and decreases with increasing temperature. When the aqueous suspension of MgCO3 is saturated with CO2, the latter dissolves due to the formation of Mg (HCO3) 2 bicarbonate. Basic magnesium carbonates are released from aqueous solutions in the absence of excess CO2. With carbonates of a number of metals, magnesium carbonate forms double salts, which include the natural mineral dolomite MgCO3 · CaCO3.