– Ca2+ 8 (cubic) : F– 4 (tetrahedral)
Ca2+ with F– in all Td holes
Polyhedra – Edge-sharing , edge-sharing
Cations form the cubic close packing while anions fill all tetrahedral holes.
Ca2+ ions are coordinated in cubic fashion (CN=8) while F– ions are tetrahedrally coordinated (CN=4)
Related Structure: Antifluorite (Na2O)
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