Magnesite Markgraf S A, Reeder R J American Mineralogist 70 (1985) 590-600 High-temperature structure refinements of calcite and magnesite Sample: T = 24 C _database_code_amcsd 0000990 4.635 4.635 15.019 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 .0059 .0059 .00056 .00295 0 0 C 0 0 .25 .0071 .0071 .0005 .00355 0 0 O .2778 0 .25 .0058 .0091 .00082 .00455 -.00015 -.0003