t 3 2 A SYSTEM O F 



This verges more to the blue 

 than to the green colour. It is 

 made at Fahlun in Dalarne, from 

 the water which is pumped out of 

 the copper- mines : in this water 

 large criftals of vitriol are often 

 ready formed. If this vitriol is 

 dipped in water, and afterwards 

 rubbed on clean iron, the copper 

 does not precipitate from it. 



3. Vitriol of zinc and iron, Vitriolitm 

 zinco-ferreum. This is the green' 

 vitriol from Goflar in the Hartz. 



4. Vitriol of zinc and copper, Vitrio- 

 litm cupreo zinceum. This is the 

 blue vitriol from Goflar. 



5. Vitriol of nickel and iron, Vitrio- ' 

 lum ferrum et niccolum continens. 



Is of a deep green colour, and is 

 contained in the ochre or decayed 

 parts of the Nickell, at the Cobalt- 

 mines at Los, in the province of 

 Helfingland*. 



* Moft part of the vitriols owe their formation to art : be- 

 caufe when fuch ores as contain fulphur, are dug out of the 

 mines by means of fire, the phlogiilon of the fulphur is by 

 the heat expelled, leaving the acid behind, which, being let 

 loofe or freed, is thereby enabled to attract and unite with 

 watry vapours, diflblving at the fame time the metals; and it 

 is thus the vitriols are formed. Every fort of ore does not 

 Commonly decay or weather in a natural manner, without 

 being promoted by art ; and this decaying or weathering is 

 moftly performed in the open air ; for which reafon no very 

 great quantity of vitriol can be expecled in that way : for 

 when any ore thus weathers or decays, thedifiblved particles 

 are by degrees carried off by the rain, and are at lalt found 

 in a diflblved Hate in certain fprings or mineral waters. All 

 fuch ores may therefore be called true vitriol ores, as contain 

 iron, copper, zinc, and nickel mineralifed with fulphur. The 

 acid in the vitriols, however, is not dulcified by the metals, 

 as it is by the alcali in the true neutral falts. 



SECT. 



