I could be wrong and don't have access to DBP today to test but I think you have to connect them anti-clockwise and you might need to close the index groups.
If you need to close the index groups it's like this:
data 6, 32 ` 6 vertices, 32 indices
` Vertex data
` x y z
`h+
data -1, -1, 1
data -1, 1, 1
data 1, -1, 1
`h-
data -1, -1, -1
data -1, 1, -1
data 1, -1, -1
` Index data
data 0,2,1,0
data 0,1,4,0
data 4,3,0,4
data 0,5,2,0
data 0,3,5,0
data 3,4,5,3
data 4,1,2,4
data 2,5,4,2
Otherwise it's like this:
data 6, 24 ` 6 vertices, 24 indices
` Vertex data
` x y z
`h+
data -1, -1, 1
data -1, 1, 1
data 1, -1, 1
`h-
data -1, -1, -1
data -1, 1, -1
data 1, -1, -1
` Index data
data 0,2,1
data 0,1,4
data 4,3,0
data 0,5,2
data 0,3,5
data 3,4,5
data 4,1,2
data 2,5,4
I think...