C 73 ] 



VITRIOL ATED IRON. 

 ■, Iron combined with Vitriolic Acid 



Synonymous Names. 

 rSal Martis. 

 VITRIOL Copperas, or green copperas. 

 ATED " -1 Vitriolum vi ride, green vitriol. 

 1 Martial vitriol. 



IRON. 



Vitriol of iron. 

 LSulphate of iron. 



Although this fait is formed from the decom- 

 position of martial pyrites, which decompofe 

 very readily, and are extremely common ; and 

 is formed alfo by other natural proceffes; and al- 

 though this fait is by no means uncommonly 

 found folid, in it's native ftate, yet it is very 

 rarely met with in mineral waters. Its. chryftals 

 are of a green colour. 



It is dete&ed nearly as the former. 



A, a. By expofing it to the air it will not fo 

 foon, or fo perfectly, depofite the iron in a brown 

 precipitate as the former page 71. The vitriolic 

 acid is not fo readily decompofed ; it will have 

 the fame rainbow coloured pelicle on it. 



b. On adding the tin&ure of galls, the fame 

 purple colour will appear as defcribed p. 72, 



c. On adding the Pruffian lixivium the fame 

 colour will be formed, as page 72, and that al- 

 though it has been firft heated. 



d. On adding a folution of cauflic alkali the 

 liquor will become yellow, and, after fome time, 



L depofite 



