Novel monodispersed peanut-type SrSO4 (celestine) particles have been prepared using a facile precipitation reaction of Sr-EDTA chelating precursors at ambient temperature. The as-formed products were studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen absorption-desorption and differential scanning calorimetry-thermogravimetry (DSC-TG) measurement. The monodispersed SrSO4 particles with an average length of 1.7 mu m and an aspect ratio of 1.4 appear unusual peanut-type morphology. These SrSO4 Particles have a relatively large Brunauer-Emmett-Teller (BET) surface area of about 20.9 m(2) g(-1) and contain mesopores with a mean pore size of about 34.3 nm. The SrSO4 particles exhibit an excellent thermal stability from room temperature to 1400 degrees C with a structural transformation at 1158.3 degrees C. The growth mechanism of the monodispersed peanut-type celestine particles was discussed to obtain a better understanding on their formation process. (C) 2008 Elsevier B. V. All rights reserved.