The Earth’s crust contains 2% of Magnesium, seawater contains 0.13% on average and some seas and lakes contain up to 5%. These are the two sources from which Magnesium is obtained.
Several minerals contain Magnesium, including magnesite, dolomite, olivine, brucite and kieserite. Magnesium can be obtained from magnesite or Magnesium chloride, through precipitation in hydroxide form then calcination.
The magnesia supplied by TIMAB Magnesium are mainly derived from carbon rock.
There are two distinct types of rock: macro-crystalline – these contain large crystals and are not very porous. They generally contain more CaO. cryptocrystalline – these are more porous and with smaller crystals. These usually contain more SiO2, but little iron and manganese.