Magnesium citrate 14-hydrate dehydrates endothermically on heating giving rise to the nanohydrate intermediate at 200-degrees-C. On further heating the anhydrous magnesium citrate is then formed and instantaneously loses two more moles of water forming magnesium aconitate which then decomposes to magnesium carbonate and finaly to magneisum oxide. The decomposition course has been monitored by TG, DTA and DSC measurements from which the non-isothermal kinetic and thermodynamic parameters have been determined. The decomposition processes have been characterized by analysing the decomposition products from each process using spectroscopy and X-ray diffractometry. The morphological and textural changes accompanying the decomposition processes have been examined by scanning electron microscopy.