Citation: Hughes, J. M.; Mariano, A. N.; Drexler, J. W. (1992). Crystal structures of synthetic Na-REE-Si oxyapatites, synthetic monoclinic britholite Locality: synthetic. Neues Jahrbuch fur Mineralogie, Monatshefte, 1992, pp. 311-319.
Formula: F0.19 Gd4.405 Na0.595 O12.81 Si3
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: F2 Gd10 Na10 O26 Si6 (F Gd5 Na5 O13 Si3)
Multiplicity: 1