Prosopite
Pudovkina Z V, Pyatenko Y A
Doklady Akademii Nauk SSSR 190 (1970) 665-667
About the structure of the prosopite, Ca[Al2F4(OH)4], and about
some features of the fluoroaluminate crystal chemistry
_database_code_amcsd 0012448
6.76 11.12 7.32 90 95.00 90 C2/c
atom    x    y    z Biso
Ca      0 .461  .25  .62
AlI   .25  .25    0  .62
AlII    0 .143  .25  .62
FI   .077 .382 .965  .62
FII  .182 .021 .285  .62
OHI  .201 .264 .257  .62
OHII .023  .15 .997  .62