[chrisso80b]

Not sure where this should come under but here goes..

The question asks me, predict the coordination of the cations in the following materials:
a). Fe₃O₄ spinel
b). ZnFe₂O4 spinel
c). MnVO₃ perovskite

I know the crystal structures of them all (i think) just dont know how I'd answer this, any help appreciated!
Chris

[AWK]

http://en.wikipedia.org/wiki/Coordination_number