Citation: Hughes J M; Cameron M; Mariano A N (1991). Rare-earth-element ordering and structural variations in natural rare-earth-bearing apatites sample B from the Oka carbonatite. American Mineralogist, 76, pp. 1165-1173.
Formula: Ca4.557 Ce0.423 F0.335 H2 Na0.02 O12.664 P2.595 Si0.405
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Ca10 Ce10 F2 Na4 O28 P6 Si6 (Ca5 Ce5 F Na2 O14 P3 Si3)
Multiplicity: 1