AM_TAPP-tetragonal Mg212Fe317Ge256O12 Formula: Ge2.56 Fe3.21 Mg2.08 O12 Name: TAPP-tetragonal Mg2.12Fe3.17Ge2.56O12 Unit cell: 6.8153 6.8153 18.669 90.0 90.0 90.0 , V=867.14 Space group: I-42D (122)

Levy D , Barbier J , American Mineralogist , 85 (2000) p.1053-1060, (Mg,Fe).85(Mg,Fe)4(Fe,Ge)3O12: A new tetragonal phase with its comparison, with garnet