1 1 1 90 90 90
#MgO6 octahedron  Oh
 1 1 .1 .1
Mg     1   .00010  0.00100   .00050
O1     1  2.11000  0.01000   .00000
O2     1 -2.10000  0.01000   .00100
O3     1   .00000  2.12000   .01000
O4     1   .00000 -2.11000  -.01000
O5     1  -.01000   .00000  2.12000
O6     1   .01000   .01000 -2.11000