Part 7

§ 65.

MAGNESIA ſalita (magneſia and muriatic acid) is found diſſolved in various waters, but plentifully in ſea water, to which it gives a diſagreeable bitterneſs.

§ 66.

MAGNESIA aerata (common magneſia) with an exceſs of aerial acid it becomes ſoluble in cold water, otherwiſe it is ſcarce ſoluble at all, and therefore ſhould be claſſed with the earths. (§ 21.)

§ 67.

ARGILLA vitriolata (alum) is ſometimes ſpontaneouſly generated by the decompoſition of pyrites lodged in clay, or in argillaceous ſchiſtus.

It is found in a ſpring at Steckenitz in Bohemia, in Eaſt Bothnia and elſewhere. What is commonly called plumoſe alum is not a ſaline ſubſtance.

ARGILLA (clay) united to the nitrous, muriatic, or aerial acids has not to my knowledge hitherto been found in any waters.

METALLIC SALTS.

§ 68.

The native ſalts belonging to this diviſion, may be diſtinguiſhed by the phlogiſticated alkaly which precipitates them all. The few which have ſaline properties (§ 20.) we ſhall mention here, referring the reſt to the mineralized metals.

§ 69.

CUPRUM vitriolatum (vitriol of copper, blue vitriol) is found in the mines of Herregrund, Fahlune, and others which contain copper pyrites.

§ 70.

FERRUM vitriolatum (vitriol of iron, green vitriol) is formed from the decompoſition of the more common pyrites.

§ 71.

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.

§ 72.

NICCOLUM vitriolatum (vitriol of Nickel) ſometimes exiſts from the decompoſition of ſulphureous ores of Nickel.

§ 73.

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.

§ 74.

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.

TRIPLE SALTS.

§ 75.

The compound ſalts hitherto enumerated are ſuch as are compoſed of two ingredients only; but ſometimes three or more are ſo united as not to be ſeparated by chryſtallization. The vitriols that we are acquainted with are hardly ever pure, and two or three of them ſometimes are joined together.