Abstract：Since the content of sphene in metamorphic rocks was very low and the optical characteristics of crystal were not obvious, it was difficultly identified by polarizing microscope and X-ray diffraction (XRD). The elements in ore were detected by scanning electron microscope/energy disperse spectrometer(SEM/EDS) to obtained the approximate content of elements. Based on the qualitative analysis results, the file list of testing samples was established using the corresponding data file of standard sample. The mass fraction of elements in sample was calculated according to the strength of elements using Casino procedure and Quanta procedure. Then, the chemical composition of testing sample was calculated according to the ratio law of anion-cation electrovalence balance in mineral chemical formula. The analysis results indicated that the mass fraction of SiO2, CaO and (TiO2+Fe2O3+Al2O3+CrO2) in eight samples was 33.36%-34.10%, 25.85%-27.00% and 39.31%-40.45%, respectively, which was basically consistent with the main chemical composition of sphene. The experimental results indicated that the relative standard deviation (RSD, n=10) of O, Si, Ca, Ti and Fe in one sphene sample was 0.23%, 0.30%, 0.28%, 0.26% and 1.6%, respectively. The precision could meet the requirements. The determination results of proposed method were consistent with those obtained by electron microprobe spectroscopy.
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