* example of hexagonal lattice (graphite) 
1 1 2
60 90 90

atoms
0 0 0 c c1
0 1 0 c c2
1 0 0 c c3
0 0 1  c c11
0 1 1 c c22
1 0 1 c c33

bonds
c1 c2 h
c1 c3 h
c2 c3 h
c11 c22 h
c11 c33 h
c22 c33 h
c1 c11 v
c2 c22 v
c3 c33 v

prop  
c red .3
h lightblue
v green

sym
r 0 0 1 0 0 0 6

cells
-1 0 0
1 0 0


frame off
landscape