TAB. LXXVIL 



CUPRUM sulphuratum. 

 Sulphuret of Copper. 



Class 3. Metals. Order 1. Homogeneous. 

 Gen. 10. Copper. Spec. 4. Sulphuret of Copper, 

 Diu. 1. Crystallized. 



Syn. Yellow copper ore. Kiriv. v. 2. 140. 

 Copper pyrites. Syst. Min. Jameson. 

 Kupfer-kies. Emmerl. v. 2. 232. Werner. 

 Cuivre pyriteux. Haiiy, v. 3. 529. 



1 his copper ore is not uncommon j but the form of the 

 crystallization in this specimen is either rare, or has been 

 hitherto overlooked by most mineralogical writers. Tetra- 

 edrons have been spoken of, but not with lenticular convex 

 faces, which seems a character of this ore when crystallized 

 in teiraedrons; at least most British specimens have some 

 inclination to convexity. These appear to be always in- 

 clined to tarnish, very often assuming a coat, either of the 

 colour of blued steel, or blueish black \. and it often has the 

 green patina, or oxide of copper, on the surface, which 

 count Bournon speaks of in his description of yellow cop- 

 per; Phil. Trans, for 1801. When fresh broken it is of a 



N 2 



