TAB. XXIX. 



FERRUM sulphureum. 

 Sulphuret of Iron. Tyrites* 



Class 3. Metals. Order 1. Homogeneous. 

 Gen.?. Iron. Spec. 5. Sulphuret of Iron, 



Div. 1. Crystallized. 



Syn. Martial pyrites. Kirw, v. 2. 7& 



Pyrites martiales. Marcassites. De Lisle, v. 3. 208, 

 Schwefel Ides. Emmerl. v. 2. 289. 

 Fer sulfure. Haiiy, v. 4. 65. 



I HE upper figure is from Cornwall. 



This substance is very universal, and not rarely occurs 

 crystallized. It is perhaps as often found in the cubic or 

 primitive form as any thing we know of, especially among 

 the schistose rocks in Wales, Scotland, Cornwall, and Ire- 

 land, on what Dr. Babington denominates Calp, vulgarly 

 called Irish Diamonds. This sort was used formerly for 

 making buttons, and was in fashion as jewellery for ladies" 

 ornaments about half a century ago, being cut and polished 

 by the lapidaries for that purpose, often to the destruction 

 of the natural crystal. It is often found among coals, &.c. 



