Popocat?petl produces a mixture of andesitic and dacite lava in the current cycle of activity. Andesitic, or Basaltic Andesite, is black volcanic rock that contains 55% silica. Dacite, on the other hand, is an igneous, volcanic rock that has a composition that is between Andesite and Rhyolite.

Cortes passed the Popocate`petl and the Volca`n Popocate`petl

Yes. Some examples would be the Popocatépetl, Paricutín or Pico de Orizaba volcanoes:

http://en.wikipedia.org/wiki/Category:Volcanoes_of_Mexico

Popocatépetl is 17,930 ft tall or approximately 5,465 meters tall currently.

With its 5636m (18,490ft), the highest mountain in Mexico is the Pico de Orizaba (aka Citlaltépetl). It's located in the Mexican states Puebla and Veracruz and is part of the Trans-Mexican Volcanic Belt.