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The
structure of cubic ZnS (mineral name "zinc blende") may be viewed
as a CCP lattice of anions (Z = 4), with the smaller cations occupying
every
other Td hole (Z = 4) or vice versa.
An equivalent description of this lattice
is as interpenetrating FCC lattices of equal dimensions, one for the anions
and one for the cations.
Note that the other form of ZnS, wurtzite,
is hexagonal, not cubic, and can be described as an HCP lattice of anions
with cations in every other Td hole.
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