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The RF thermal plasma synthesis route was used for the preparation of alumo-silicate spherical particles. Homogeneous solid mixtures of raw materials (Al 2 O 3 , SiO 2 and KOH) were used as precursors. SiO 2 powders with different particle sizes (6 μm and 40 μm) were taken for this synthesis. For the characterization of obtained materials, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) analysis, infrared spectroscopy (FTIR) and thermogravimetric analysis (TG/DTA) were used. Nanosized amorphous ceramic particles were formed via two-step RF thermal plasma processing. It was demonstrated that the size of the SiO 2 particles plays a significant role in the formation of the alumo-silicate nanoparticles.