Pseudobrookite Yang H, Hazen R M American Mineralogist 84 (1999) 130-137 Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states Sample P1400, x(Ti) in M1 = .485, P = 7.51 GPa _database_code_amcsd 0002086 9.6080 9.8024 3.7114 90 90 90 Bbmm atom x y z occ Biso Mg1 .8066 .25 0 .515 .56 Ti1 .8066 .25 0 .485 .56 Ti2 .1357 .4367 0 .7575 .54 Mg2 .1357 .4367 0 .2425 .54 O1 .2354 .25 0 .74 O2 .0471 .8821 0 .82 O3 .3137 .9310 0 .66