Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Lapideum - mineral kingdom
         Class Petræ - stones
           Order Calcarii - calcareous stones
             Genus Spatum - feldspar see feldspar
               1 Spatum fissile, lamellis dehiscentibus
               1.0 Spatum lamellatum see Spatum fissile, lamellis dehiscentibus
               2 Spatum compactum, opacum nitidum - orthoclase
               2.0 Spatum vulgare - orthoclase see Spatum compactum, opacum nitidum
               3 Spatum compactum pellucidum
               3.0 Crystallus Islandica see Spatum compactum pellucidum