AM_TAPP Formula: Si2.91 Al1.942 Fe.49 Mg2.658 O12 Name: TAPP Unit cell: 6.5269 6.5269 18.1835 90.0 90.0 90.0 , V=774.62 Space group: I-42D (122)

Finger L W , Conrad P G , American Mineralogist , 85 (2000) p.1804-1807, The crystal structure of Tetragonal Almandine-Pyrope Phase (TAPP):, A reexamination