Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies "crystal-kingdom" "minerals constituting rocks" "Alumina-Silicates containing water" zeolite Cronstedt, 1756 levyne (Brewster, 1825b) D.S. Coombs et al., 1997 1 levyne-Caᵀ Coombs et al., 1997 2 levyne-Na Coombs et al., 1997