FERRUM aeratum (iron with aerial acid) diſſolved by an exceſs of acid in the lighter chalybeate waters.
FERRUM nitratum, and ſalitum (iron with nitrous and muriatic acids) have never yet been found native.
NICCOLUM vitriolatum (vitriol of Nickel) ſometimes exiſts from the decompoſition of ſulphureous ores of Nickel.
ZINCUM vitriolatum (vitriol of zinc, white vitriol) is ſometimes, though rarely, produced By the decompoſition of pſeudogalena, or black Jack, becauſe this ſubſtance does not very readily decompoſe ſpontaneouſly.
[[35]]MANGANESIUM ſalitum (manganeſe united to muriatic acid) exiſts in ſome waters Mr. Hielm ſays.
Whether manganeſe be ever united to waters like iron, by means of an exceſs of aerial acid, we know not.