Magnesite from Tsakasimptah in Nigeria was characterized using XRF, XRD and SEM/EDS techniques for oxides constituents, mineralogical composition and surface morphology respectively in order to determine its suitability for glass making. XRF result revealed that the sample consists of 63.3 % MgO, 17.7% SiO2, 4.86% Al2O3, 0.09% Na2O, 0.05% P2O5, 2.86% Fe2O3, 0.74% K2O, 0.4% TiO2, 9.77% CaO, 0.08% MnO2, 0.083% Rb2O, 0.080% SO3, 0.013% ZrO2 and 0.05% SrO2. XRD result shows the presence of calcio-olivine 80.8% and Olivine HP 19.2% as dominant and lesser minerals respectively. The XRD patterns of the sample demonstrated that the highest diffraction peak corresponds to the major mineral. The Crystallite size and lattice strain of dominant mineral are 184.95A and 0.22% respectively. Fe2O3 and other colourants in the sample are higher than the acceptable level. Such impurities can be removed through beneficiation for quality glass making otherwise they would compromise the quality of glass.