AM_Prosopite Formula: Ca Al2 F4 (O4 H4) Name: Prosopite Unit cell: 6.76 11.12 7.32 90.0 95.0 90.0 , V=548.16 Space group: C12/C1 (15)

Pudovkina Z V , Pyatenko Y A , Doklady Akademii Nauk SSSR , 190 (1970) p.665-667, About the structure of the prosopite, Ca[Al2F4(OH)4], and about, some features of the fluoroaluminate crystal chemistry