c 63 3 
V. Analysis of a triple Sulphuret, of Leaf Antimony , and Copper , 
from Cornwall. By Charles Hatchett, Esq. F. R. S. 
Read January 26, 1804. 
The substance which forms the subject of this Paper, has 
hitherto been regarded as an ore of antimony ; it is extremely 
rare, and has only been obtained from Huel Boys, in the parish 
of Endellion, a mine which, from deficiency of profit, has for 
some time been abandoned. 
The scarcity of the ore has probably been the cause of its 
being unknown to foreign mineralogists ; indeed few even of the 
British cabinets possess it ; but the most perfect and beautiful 
specimens are (as far as I know) to be seen in the splendid 
collection of Philip Rashleigh, Esq. of Menabilly, in Cornwall. 
To Mr. Rashleigh we are indebted for the first description 
of this ore ; * but no subsequent notice had been taken of it, 
until the preceding Paper was written by the Count de Bournon, 
whose eminent merits, as a mineralogist and crystallographer, 
are well known to this Society. 
1. 
The specific gravity of this substance is 57 66, at 65° of 
Fahrenheit. 
* Specimens of British Minerals, selected from the Cabinet of Philip Rashleigh, 
Esq. F. R. S. Sc c. Part I. page 34, Plate XIX. 
