Magnesium is an alkaline earth metal and the most commonly used structural metal after steel and aluminium. It is also used in specialty alloys and as an incendiary.
Rio Tinto - http://www.riotinto.com/ K-Mag - http://www.kmag.com/ - This division of Mosaic Co. (NYSE: MOS) makes potassium magnesium sulfate fertilizers which are an excellent source of magnesium, potassium, and sulfur.
Latrobe Magnesium (ASX:LMG)
Quay Magnesium (ASX:QMG)
