Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies "Lapideum Regnum" nom. inval. - mineral kingdom Class "Petrae" - stones Order "Vitrescentes" - glassy stones Genus "Qvartzum" [U.R. von Kalbe], [1505?] - quartz "Qvartzum purpureum" - amethyst