There are some types of crystals we call them XY type (i.e. NaCl) or X2YZ type? Could XY type be a special case of X2YZ type by assigning Y=Z?

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    $\begingroup$ Sometimes it can, sometimes it can't. That depends on how different the crystal positions of Y and Z are. $\endgroup$ – Ivan Neretin Jan 4 '17 at 5:18
  • $\begingroup$ Could you give me some example about why cannot? $\endgroup$ – latra Jan 7 '17 at 8:33

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