Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Lapideum - mineral kingdom
         Class Petræ - stones
           Order Calcarii - calcareous stones
             Genus Schistus
               1 Schistus cinereus
               1.0 Fissilis inutilis see Schistus cinereus
               2 Schistus nigricans friabilis
               2.0 Fissilis vulgaris see Schistus nigricans friabilis
               3 Schistus niger duriusculus
               3.0 Fissilis Lapis see Schistus niger duriusculus
               4 Schistus niger durus clangosus
               4.0 Ardesia tegularis see Schistus niger durus clangosus