f. Sulphate of t 

 Iron. 



C M7 3 



Synonymous Names, 

 Martial vitrioL 

 Green vitrioL 

 Vitriol of iron. 

 Green copperas. 



a combination of the fulphuric acid with iron, 



g. Sulphur et of Iron, Martial Pyrites; cryftallized 

 in tetrahedrons, and their modifications, in <:ubes, 

 oftohedrons, folid, interfperied, capillary, ftriaU 

 ed ; confifts of iron and fulphur. 



Mr. David Mufchet, of the Clyde iron works, 

 divides iron-ftones into, , 



U Argillaceous Iron-ftone, having clay for it's 

 chief component earth, and this clay comparative- 

 ly pure and free from fand. 



2. Calcareous Iron-ftone, pofTefling lime for it's 

 chief mixture, and this lime alfo comparatively 

 defthute of fand. 



3. Siliceous Iron-ftone, uniting clay and lime, 

 containing large proportions of filex. 



4. Iron-ftone containing nearly the fame pro- 

 portions, of clay, lime and filex. 



Befides thefe are defcribed, ;< Primary ores of 

 iron," fo named in contradiftinBion to ores which 

 appear, like iron-ftones, to have been formed by 

 a fecondary agency. 



V % H. TIN. 



