AM_Whitlockite_7 Formula: Ca9.267 (Fe.2 Mg.8) P7 O28 Name: Whitlockite Unit cell: 10.324 10.324 37.103 90.0 90.0 120.0 , V=3424.80 Space group: R3C (161)

Gopal R , Calvo C , Nature Physical Science , 237 (1972) p.30-32, Structural relationship of whitlockite and beta-Ca3(PO4)2, Locality: Palermo Quarry, Sample: Heated