Magnesite Markgraf S A, Reeder R J American Mineralogist 70 (1985) 590-600 High-temperature structure refinements of calcite and magnesite Sample: T = 300 C _database_code_amcsd 0000992 4.642 4.642 15.096 90 90 120 R-3c atom x y z B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Mg 0 0 0 .0107 .0107 .00099 .00535 0 0 C 0 0 .25 .0104 .0104 .00076 .0052 0 0 O .2772 0 .25 .0097 .0144 .00132 .0072 -.0003 -.0006