Simple and economical techniques are essential to synthesize valuable nanocomposites such as precipitated calcium carbonate (PCC)/poly(methyl methacrylate) (PMMA) in industrial scale and in laboratory conditions. Moreover, synthesis of nanocomposites using naturally occurring minerals is a great achievement for the value addition of natural resources as well as for the replacement of high quality expensive raw materials. We report such new method to synthesize PCC/PMMA nanocomposite using naturally occurring dolomite. The synthesized product is characterized by using X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, thermo gravimetric analysis (TGA), differential scanning calorimetry (DSC) and atomic absorption spectrophotometry (AAS). It is found that PMMA favors the formation of calcite in the conditions favorable for the formation of aragonite. The study recommends dolomite as an alternative natural resource to synthesize PCC nanocomposites with sufficient quality to meet with industrial requirements. The PCC/PMMA nanocomposite shows specific outstanding properties of acid resistance and greater dispersibility in organic phases. (C) 2012 Elsevier B.V. All rights reserved.