Strontium and Calcium chloroapatites were synthesized by wet chemical method, characterized by X-ray diffraction and are found to be phase Pure materials. The measured room temperature lattice parameter of Ca-10(PO4)(6)Cl-2 is a = 9.523 angstrom, c = 6.855 angstrom and for Sr-10(PO4)(6)Cl-2 is a = 9.876 angstrom, c = 7.188 angstrom. Heat capacity measurements were carried out on Ca-10(PO4)(6)Cl-2 arid Sr-10(PO4)(6)Cl-2 by DSC in the temperature range 298-800K. The heat capacity values of Sr-10(PO4)(6)Cl-2 is higher at all temperatures than Ca-10(PO4)(6)Cl-2. Enthalpy and entropy increments were computed. Heat capacity Values of Ca-10(PO4)(6)Cl-2 arid Sr-10(PO4)(6)Cl-2 at 298 K are 758 and 868 J K-1 mol(-1). respectively. (C) 2008 Elsevier B.V. All rights reserved.