Atomization enthalpies of transition elements
The sorts of generalities always sweep aside other considerations.

$\ce{^26Fe}$ has a ​body-centered cubic crystal structure. 

$\ce{^27Co}$ has a ​hexagonal close-packed crystal structure. 

$\ce{^28Ni}$ has a ​face-centered cubic crystal structure. 

Here is a nice table showing the overall trends.