Magnesium is found in seawater and in deposits on Earth. Magnesite, dolomite and carnalite are ores containing magnesium. Magnesium is very reactive and is found as a compound in nature. Magnesium chloride is produced from magnesite and carnelite and also from seawater. It is put through electrolytic smelting to recover the metal. Another method is thermic reduction under vacuum conditions. Dolomite ore is used and aluminum is added or ferrosilicon. The world has much magnesium from seawater and from ore sources. Most is produced in China. Russia, Israel, Kazakhstan, and in less amounts Canada, Brazil, Serbia and Ukraine, produce the rest.