Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Lapideum - mineral kingdom
         Class Mineræ - minerals
           Order Mercurialia - metals
             Genus Ferrum - iron see iron
               01 Ferrum sulphure non adulteratum
               01.0 Minera martis optima see Ferrum sulphure non adulteratum
               02 Ferrum sulphure arsenico imprægnatum
               03 Ferrum sulphure pyrite imprægnatum
               04 Ferrum petræ vitrescentis, pauperrimum
               05 Ferrum petræ vitrescentis, dives
               06 Ferrum nudum octaëdron
               06.0 Ferrum purum see Ferrum nudum octaëdron
               07 Ferrum tessulatum, fere nudum
               07.0 Ferrum sub-purum see Ferrum tessulatum, fere nudum
               08 Ferrum fracturis nitidum
               08.0 Minera ferris specularis see Ferrum fracturis nitidum
               09 Ferrum ferrum & mundi polos respiciens
               09.0 Magnes see Ferrum ferrum & mundi polos respiciens
               10 Ferrum ollaris è centro radiati Zincei, extus puculati
               10.0 Magnesia see Ferrum ollaris è centro radiati Zincei, extus puculati
               11 Ferrum amianti angulosi rigidi
               11.0 Hæmatites see Ferrum amianti angulosi rigidi
               12 Ferrum amianti rigidi, extus puculati
               12.0 Nucleus hæmatitidis see Ferrum amianti rigidi, extus puculati