Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           "minerals constituting rocks"
             "Quartz, and Silicates containing alumina, without water"
               01.1 quartz [SiO2] [U.R. von Kalbe], [1505?]
               01.2 opal [SiO2.nH2O]
               02 feldspar
               03 mica
               04.1 garnet
               04.2 idocrase
               05 epidote [Ca2Fe+3Al2Si3O12(OH)]
               06 scapolite
               07 andalusite
               08 staurotide
               09.1 kyanite
               09.2 sillimanite
               10 tourmaline
               11.1 topaz
               11.2 beryl