AM_Graftonite
Formula: Ca (Fe1.38 Mn.62) P2 O8
Name: Graftonite
Unit cell: 8.91 11.58 6.239 90.0 98.9 90.0 , V=635.98
Space group: P121/C1 (14)

Calvo C , American Mineralogist , 53 (1968) p.742-750, The crystal structure of graftonite