Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           "minerals constituting rocks"
             "Quartz, and Silicates containing alumina, without water"
               quartz [SiO2] [U.R. von Kalbe], [1505?]
                 01 limpid quartz
                 02 amethyst
                 03 agate
                 04 chalcedony
                 05 flint
                 06 hornstone
                 07 lydianstone
                 08 jasper
                 09 sandstone
                 10 ordinary sand