Prosopite
Pudovkina Z V, Chernitsova N M, Pyatenko Y A
Journal of Structural Chemistry 14 (1973) 345-347
Refinement of the crystalline structure of prosopite, CaAl2F4(OH)4
_database_code_amcsd 0014057
6.76 11.12 7.32 90 95.0 90 C2/c
atom     x     y     z Biso
Ca       0 .4606   .25  .67
Al1    .25   .25     0  .57
Al2      0 .1407   .25  .55
F1   .0761 .3810 .9625  .88
F2   .1818 .0244 .2819  .94
OH1  .1998 .2632 .2439  .59
OH2  .0231 .1534 .9971  .64