Warwickite
Moore P B, Araki T
American Mineralogist 59 (1974) 985-1004
Pinakiolite, Mg2MnO2[BO3]; warwickite, Mg(Mg0.5Ti0.5)O[BO3]; wightmanite,
Mg5(O)(OH)5[BO3].nH2O: Crystal chemistry of complex 3 Angstrom wallpaper
structures
9.197 9.358 3.085 90 90 90 Pnam
atom     x     y   z occ Biso
Mg1  .1149 .5695 .25 .62  .72
Ti1  .1149 .5695 .25 .38  .72
Mg2  .1032 .1899 .25 .96  .44
Ti2  .1032 .1899 .25 .04  .44
B    .1673 .8753 .25      .66
O1   .0206 .8653 .25     1.07
O2   .2488 .7507 .25     1.01
O3   .2353 .0074 .25      .84
O4   .0118 .3842 .25      .87