Diamond Structre Crystallography Questions

[nugget]

Hi,

these are a couple of questions from a lab at uni, i wasn't entirely sure where to begin so if anybody has any idea help would be much appreciated

(i)A large model of the diamond structure can be described as two interpenetrating FCC lattices (i haven't found any diagrams that display this simply and point out the lattices...). What is the displacement of one from the other?

(ii)describe the lattice type and the basis of the diamond structure.

I'm assuming that (ii) is easily answerable with the result from (i) but i don't know how to pick out the fcc structures, and hence don't know what their displacement from each other is.

thanks

 

[Mapes]

http://phycomp.technion.ac.il/~nika/diamond_structure.html"