Zinc Sulfide
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.
(crossed stereo pair)
An equivalent description of this lattice
is as interpenetrating FCC lattices of equal dimensions, one for the anions
and one for the cations.
(crossed stereo pair)
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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