tetrahedron 
1.0
10.0 0.0 0.0
0.0 10.0  0.0
0.0 0.0 10.0
Si
4

Cartesian
1.0 1.0 1.0
-1.0 -1.0 1.0
-1.0 1.0 -1.0
1.0 -1.0 -1.0
