Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies "crystal-kingdom" "minerals constituting rocks" "Alumina-Silicates containing water" zeolite Cronstedt, 1756 brewsterite (Brooke, 1822) D.S. Coombs et al., 1997 brewsterite-Ba Coombs et al., 1997