All of the following .cif files can be opened using your freeware copy of Mercury that you downloaded from the CCDC.
All of these files originated from The Materials Project web-resource. Some have been altered by me using Mercury in order to emphasize key features (like closest packing of planes). I encourage you to spend time exploring other materials and crystals using this wonderful not-for-profit web-resource.
To view a file you will need to download it first and then open it using Mercury.
Cesium Chloride CCP (Cu metal) fluorite (CaF2) perovskite (BaTiO3)
Rock Salt CCP (ABC...layers labeled) antifluorite (K2O) spinel (MgAl2O4)
ZnS (sphalerite) HCP (AB...layers labeled) magnetite (Fe3O4) Magnet Cove, AR