AM_Thadeuite Formula: P2 Mg2.18 Fe.58 Mn.29 Ca.95 O10 H2 Name: Thadeuite Unit cell: 6.412 13.563 8.545 90.0 90.0 90.0 , V=743.12 Space group: C2221 (20)

Isaacs A M , Peacor D R , American Mineralogist , 67 (1982) p.120-125, The crystal structure of thadeuite, Mg(Ca,Mn)(Mg,Fe,Mn)2(PO4)2(OH,F)2