C3, cuprite

Structural typeC3
Common namecuprite
Definitionfcc lattice of cations with anions occupying ¼ of tetrahedral voids
Pearson symbolcP6
Space group224 Pn-3m Oh4
Chemical formulaA2X
Atomic positions A (4b)   0    0    0   (marked by C)
 X (2a)  1/4  1/4  1/4  (marked by S)
CoordinationXA – 4t, A – 2X + 12A (12co)
SublatticesA – fcc
PDB filesC3
SubstancesCu2O, Ag2O, Pb2O