POSCAR generated by cell class
1.0
  2.9064986323703392    0.0000000000000000    0.0000000000000000
 -1.4532493161851689    2.5171016516974420    0.0000000000000000
  0.0000000000000000    0.0000000000000000    2.8365986652612101
 1 1
Direct
  0.0000000000000000    0.0000000000000000    0.0000000000000000 # 11
  0.6666666666666666    0.3333333333333333    0.5000000000000000 # 21