Montgomeryite
Moore P B, Araki T
American Mineralogist 59 (1974) 843-850
Montgomeryite, Ca4Mg(H2O)12[Al4(OH)4(PO4)6]:. Its crystal structure and
relation to Vauxite, Fe2(H2O)4[Al4(OH)4(H2O)4(PO4)4].4H2O
_database_code_amcsd 0000410
10.023 24.121 6.243 90 91.55 90 C2/c
atom     x      y      z occ Biso
Ca1      0 .06115    .25     1.35
Ca2      0 .33098    .25     1.03
Mg       0  .4708    .25  .5  .75
Al1    .25    .25      0      .79
Al2      0 .17151   -.25      .84
P1      .5 .29944   -.25      .74
P2   .2582 .11548 -.0405      .87
O1   .6172  .2604  .7072     1.13
O2   .4693  .3366  .5548     1.12
O3   .3096  .1749  .0120     1.06
O4   .3754  .0872 -.1497     1.24
O5   .1362  .1178 -.2009     1.24
O6   .2184  .0856  .1620     1.69
OH   .3712  .2715  .2189      .88
Wat1 .1614  .3301  .5292     2.11
Wat2 .1122  .0261  .5826     1.59
Wat3 .1188  .4731  .5723     3.69