wichita.edu
…facile inde colligitur, maxima eum ad igni resistendum potentia et efficacia pollere; et patet in nonnullis aliis rebus uti supra docuimus. videlicet in auro, adamante, selenite, quin et omnibus saxis et metallis, que quamvis igni vehementer resistant, difficulter tamen vel in liquorem calcem, vel similem a priori differentem formam Chymica arte reduci…
https://www.wichita.edu/academics/fairmount_las/geology/wparcell/Kircher/Mundus/Vol2Bk08.php