Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           "minerals constituting rocks"
             "Quartz, and Silicates containing alumina, without water"
               feldspar
                 1 orthoclase [KAlSi3O8] - potash-feldspar
                 2 albite [NaAlSi3O8] - soda-feldspar
                 3.1 oligoclase [([NaSi]0.9-0.7[CaAl]0.1-0.3)AlSi2O8]
                 3.2 andesine [([NaSi]0.7-0.5[CaAl]0.3-0.5)AlSi2O8]
                 4 labradorite - lime-feldspar
                 5 anorthite [CaAl2Si2O8]