[Wien] the difference between Zinc blende and Sphalerite structure

[Sahra Sahraii]

Dear
WIEN2k users
 I want to study the InSb and GaSb
compounds, InSb has zinc blende structure but GaSb has Sphalerite structure, I have made the zinc blende
structure with two positions (000) and (1/4,1/4.1/4) with a fcc structure, but
I don’t know how can I make the Sphalerite structure, Is this structure the same
as the zinc blende structure, if they are  same why don’t they have the same name?.
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