To see an adequate portion of the structure (not just the unit cell), choose
Transform > Set Range, and click on
Expand 2 times to extend the structure along all axes by 20%. Click
OK.
Next, draw the Fe-O bonds by choosing
Edit > Bonding. Click on
Add and choose "Fe" under
From and "O" under
To. Clicking on the box under
Info will give you information about coordination. Finally, click on
OK to draw the bonds. The window should look like this...
Is the coordination of all Fe's in this mineral the same, or is there more than one crystallographic site that accepts Fe?
There are two Fe sites: one tetrahedral and the other octahedral.