Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies "crystal-kingdom" "minerals constituting rocks" "Alumina-Silicates containing water" zeolite Cronstedt, 1756 dachiardite (d'Achiardi, 1906) D.S. Coombs et al., 1997 dachiardite-Caᵀ Coombs et al., 1997