Magnesite Markgraf S A, Reeder R J American Mineralogist 70 (1985) 590-600 High-temperature structure refinements of calcite and magnesite Sample: T = 500 C _database_code_amcsd 0000994 4.650 4.650 15.186 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 .0158 .0158 .00154 .0079 0 0 C 0 0 .25 .01360 .01360 .00118 .00680 0 0 O .2764 0 .25 .0138 .0202 .00202 .0101 -.0004 -.0008