Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Lapideum - mineral kingdom
         Class Petræ - stones
           Order Apyri - stones unchanged by fire
             Genus Talcum - talc
               1 Talcum durum crassum, cortice nitido - hornstone
               1.0 Corneus Lapis - hornstone see Talcum durum crassum, cortice nitido
               2 Talcum durum coriaceum
               2.0 Tunicatus Lapis see Talcum durum coriaceum
               3 Talcum friabile molliusculum
               3.0 Talcum offic. see Talcum friabile molliusculum
               4 Talcum friabile fragile membranaceum
               4.0 Talcum aureum see Talcum friabile fragile membranaceum