65 



TAB. CXXXV. 



PLUMBUM cupreo-antimoniatum sulphu- 



reum. 

 Sulphurated Cupreo-antimoniated Lead. 



Class 3. Metals. Order 1. Homogeneous. 

 Gen. 15. Lead. Spec. 3. Sulphuret of Lead. 



Syn. Triple Sulphuret of Lead, Antimony, and Copper. 

 Bournon and Hatchett in Phil. Trans. 1 804, 

 Part I. 

 Ore of Antimony. Rashleigh, v. 1. pi. 19. 



This comes from Huel Boys in the parish of Endellion, in 

 Cornwall, and has been always rare, and was supposed to 

 be a Sulphuret of Antimony, until Mr. Hatchett analysed 

 a substance nearly related to it, but somewhat lighter-co- 

 loured, and found in the same mine— see pi. 136 — which 

 agrees with it in the nature of its crystallization, as is pointed 

 out with much ingenuity by the Count de Bournon in the 

 Philosophical Transactions. 



They are found to be triple Sulphurets, and when most 

 pure contain chiefly Lead, Antimony and Copper in the 

 metallic state in union with Sulphur. Thus the whole 

 becomes a cupreous antimoniated Galena, and, as most 

 related to Lead Ore or Galena^ we name it as above. 



The present specimen is as it were passing into this 

 triplet, as one of the common appearances of Sulphuret of 



VOL. II. G 



