Natura - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Lapideum Regnum nom. inval. - mineral kingdom
         Class Fossilia nom. inval. - Lapides aggregati
           Order Concreta - rocks
             31 Genus Saxum - rock
             32 Genus Tophus
             33 Genus Stalactites
             34 Genus Pumex
             35 Genus Aetites
             36 Genus Tartarus
             37 Genus Calculus