6 crystal
 0.0000000   0.0000000   0.0000000   1
 0.5000000  -0.2500000   0.0000000   0
 0.0000000   0.0000000   0.0000000   0
 0.6111111  -0.2222222   0.5000000   0
 0.3000000   0.0000000   0.5000000   0
 0.0000000   0.0000000   0.5000000   0