Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           mixtures
             resins
               †amber
                 †Baltic amber
                 †Bitterfeld amber
                 †Burmese amber
                 †Canadian amber
                 †Australian Cape York amber
                 †Charentese amber
                 †Dominican amber
                 †Lebanese amber
                 †Mexican amber
                 †Oise amber
                 †Raritan (New Jersey) amber
                 †Rovno amber
                 †Spanish amber