wichita.edu
…where parch’d like Cinders, and Pumis-stones; and a dust, which they call the Puteolan, like Pouder; and extinct Coals included in living Rocks. From Puteoli pass to Campagna di Roma, which is full of sulphurous Crater’s. through the Minturnan Marshes to Sumo: whence a continued Mine of Sulphur, through the Roman Plain exerts itself, in divers places,…
https://www.wichita.edu/academics/fairmount_las/geology/wparcell/Kircher/volcanoes/index.php