AM_Whitlockite_2 Formula: Ca9.061 (Mg.986 Fe.014) P7 O28 H.89 Name: Whitlockite Unit cell: 10.3477 10.3477 37.077 90.0 90.0 120.0 , V=3438.13 Space group: R3C (161)

Hughes J M , Jolliff B L , Rakovan J , American Mineralogist , 93 (2008) p.1300-1305, The crystal chemistry of whitlockite and merrillite and the, dehydrogenation of whitlockite to merrillite, Locality: Tip Top Pegmatite, Custer County, South Dakota