en Research Paper Research Paper ꞵ-tricalcium phosphate (ꞵ-TCP) and anorthite are the main crystalline components in bone china bodies. The difference in their thermal expansion coefficients causes a decrease in the thermal shock resistance of the body. In this study, anorthite was replaced with bone ash at the bone china body, and the effect of this new composition on different properties of bone china, after curing at 1260 °C for 3 hours, was investigated. The results showed that the physical and mechanical properties of the sample containing 50 wt% anorthite compared to the typical bone china improved and only 8.7% of the whiteness index diminished. Also the microstructure of samples containing Anorthite were observed without thermal crack and almost uniform distribution of Anorthite and quartz crystals in the heterogeneous glass matrix. ,Bone China Bodies,Anorthite,Thermal expansion coefficient,Thermal Cracks. 1 11 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-75-8&slc_lang=en&sid=1 Zahra RajabiMashhadi zahra_rajabi_73@yahoo.com 1800319475328460015099 1800319475328460015099 No Faculty of Materials Science and Engineering, Iran University of Science and Technology, Tehran. Rahim Naghizadeh rnaghizadeh@iust.ac.ir 1800319475328460015100 1800319475328460015100 Yes Faculty of Materials Science and Engineering, Iran University of Science and Technology, Tehran.