JMol site http://firstyear.chem.usyd.edu.au/calculators/solid_state.shtml how common inorganic structures are built from the filling of interstitial sites in CCP and HCP lattices.
The site is used as post-work for a hands-on lab about packing (http://firstyear.chem.usyd.edu.au/LabManual/E12.pdf).
A student should be able to:
- explain the difference between CCP and HCP packing
- see how many crystal structures can be built from these arrangements by different filling of the interstitial sites
There is a post-work quiz associated with the activity (see "questions" tab on website) which students complete as part of the lab mark.