CHARACTERIZATION OF FELDSPAR BY INSTRUMENTAL ANALYTICAL TECHNIQUES

摘要

Feldspar from Matari, Nigeria was analyzed using SEM, XRD and XRF techniques for micro-structural analysis, mineral phase analysis and chemical composition analysis respectively. Qualitative and quantitative XRD analyses revealed the presence of microcline 59.6%, albite 34.7% and quartz 5.71%. The XRF results showed that the feldspar contains 67.32% SiO_2, 17.54% Al_2O_3, 11.33% K_2O, 2.75% Na_2O, 0.12% CaO, 0.01% MgO, 0.02% MnO_2, 0.10% Fe_2O_3, 0.00% Ti_2O, etc and 0.14% LOI. SEM/EDX analysis shows the presence of microcline feldspar as the dominant phase, exhibiting lamellar twinning. The XRD has also revealed that potash has the highest peak, indicating its high concentration. The 0.10% Fe_2O_3 present is within the permissible level (0.1-0.3%) for glass making and also within the potash feldspar specifications (0.17%). The Matari feldspar is a microcline type, rich in potash, alumina and silica, enabling it meet the standard specifications for alumino-silicate glass.