coord_type fractional
begin elementmap
X1 Al
X2 Mg
X3 Fe
end
begin lattice
   3.5   1     2
   3     3.5   4
   5     6     3.5
end
begin coordinates
X1   0.0000000000  0.0000000000    0.0000000000
X2   0.5000000000  0.5000000000    0.0000000000
X1   0.0000000000  0.5000000000    0.5000000000
X3   0.5000000000  0.0000000000    0.5000000000
end
