Citation: Merlino, S.; Perchiazzi, N. (2010). The crystal structure of hiortdahlite II. Mineralogy and Petrology, 37, pp. 25-35.
Formula: Ca4 F3 Na2 O15 Si4 Y Zr
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: F2 O30 Si8 Y2 Zr2 (F O15 Si4 Y Zr)
Multiplicity: 1
Coordination sequences: