Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Lapideum - mineral kingdom
         Class Petræ - stones
           Order Vitrescentes - glassy stones
             Genus Silex - silica
               1.0 Pyromachus - flint see flint
               2.0 Calcedonius - chalcedony see chalcedony
               3.0 Jaspis - jasper see jasper
               4.0 Carneolus - carnelian
               5.0 Malachites - malachite
               6.0 Turchesia
               7.0 Sardius - sard
               8.0 Achates Theophrastus - agate see agate