AM_Greifensteinite Formula: Ca Be2 (Fe1.6 Al.2 Mg.2) Mn.35 P3 O17 H8.35 Name: Greifensteinite Unit cell: 15.903 11.885 6.677 90.0 94.68 90.0 , V=1257.79 Space group: C12/C1 (15)

Rastsvetaeva R K , Gurbanova O A , Chukanov N V , Doklady Chemistry , 383 (2002) p.78-81, Crystal structure of greifensteinite, Ca2Be4(Fe2+,Mn)5(PO4)6(OH)4*6H2O, Locality: Greifenstein, Saxony, Germany