Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Lapideum - mineral kingdom
         Class Mineræ - minerals
           Order Sulphura
             Genus Electrum
               1 Electrum solidum
               1.0 Succinum var. col. see Electrum solidum
               2 Electrum tenax
               2.0 Ambra grisea see Electrum tenax