Citation: Brandenberger, E (1931). Die Kristallstruktur des Koppit. Zeitschrift fuer Kristallographie, Kristallgeometrie, Kristallphysik,Kristallchemie (-144,1977), 76, pp. 322-334.
Formula: Ca1.125 Ce0.25 F0.25 Fe0.38 H0.8 K0.25 Na0.375 Nb1.63 O6.75
Chemical name: Sodium potassium calcium cerium iron(III) niobium oxide hydroxidefluoride (.38/.25/1.13/.25/.38/1.63/5.95/.8/.25)
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Ca16 Ce16 F8 Fe16 K16 Na16 Nb16 O64 (Ca2 Ce2 F Fe2 K2 Na2 Nb2 O8)
Multiplicity: 1