AM_Fairfieldite
Formula: Ca2 Mn.73 Mg.01 Fe.23 P2 O10 H4
Name: Fairfieldite
Unit cell: 5.795 6.576 5.496 102.39 108.63 90.29 , V=193.23
Space group: P-1 (2)

Herwig S , Hawthorne F C , The Canadian Mineralogist , 44 (2006) p.1181-1196, The topology of hydrogen bonding in brandtite, collinsite and fairfieldite, Locality: Foote mine, North Carolina, USA