Iztaccihuatl (5230m) is the third highest summit in Mexico. It is located in Iztaccihuatl-Popocatepetl National Park. summitpost.com has information on the peak and the normal climbing routes.
 

In addition to the FKT(s) listed here from Amecameca, guest poster "kilian" provided the following:

"vgeh" posted: