Yoderite
Higgins J B, Ribbe P H, Nakajima Y
American Mineralogist 67 (1982) 76-84
An ordering model for the commensurate antiphase structure of yoderite
Disordered after heating to 800 C, at T = 20 C
Note: the sample is from Mautia Hill, Tanzania
_database_code_amcsd 0000856
8.027 5.805 7.252 90 104.9 90 P2_1/m
atom     x     y     z occ Biso
Si1  .0634   .25 .7987     0.39
Si2  .3393   .75 .8014     0.56
Al1  .2948 .0049 .1780 .75 0.58
Mg1  .2948 .0049 .1780 .25 0.58
Al2  .3889   .25 .6299 .50 0.59
Mg2  .3889   .25 .6299 .50 0.59
Al3  .0559   .25 .3543 .84 0.47
Fe   .0559   .25 .3543 .16 0.47
O1   .0562 .9804 .2156     0.60
O2   .4532 .9764 .7785     1.14
O3   .1489   .25 .6166     0.80
O4   .2207   .25 .9930     0.74
O5   .2995   .25 .3622     0.78
O6   .1645   .75 .6299     0.72
O7   .2842   .75 .0040     0.93
O8   .3623   .75 .3631     1.04