♦232 SULPMITRET OF LEAD, COPPER, AND ANTIMONY. 



when it is recent. The crystals are difficult to determine, 

 both on account of the great number of faces they fre- 

 quently exhibit, and of the irregularity of these faces. They 

 consequently require a great deal of attention on the part 

 of the observer, to be perfectly ascertained. 

 Where founrJ. The endellion in a state of completely determined crys- 

 tallization was first observed in Cornwall, in the mine of 

 Uuel-boys, in the parish of Endellion; and from this mine 

 have been obtained the finest groupes of this substance that 

 are seen in collections, where it is in general very rare. 

 The endellion exists likewise in Siberia, where too it ap- 

 pears to be very scarce, as I know of but a single specimen, 

 which is in my possession. I have seen in the shop of Mr. 

 Maw seVeVal fragments of this substance, sent with other 

 minerals from Brazil, the biggest of which was a very large 

 single crystai, of the variety represented pi. vii,* fig. 8. 

 Lastly I am indebted to Dr. Wollaston for some small frag- 

 ments of the same substance, in which the endellion is in 

 the compact stale, mixed irregularly and very visibly to the 

 eye with the double yellow sulphuret of copper and iron ; 

 and in which are observable little cavities, including very 

 • small but well defined crystals of the same substance, inter- 

 mixed with minute specks of carbonate of lime and sulphate 

 ofbarytes. These fragments came from Peru. The endel- 

 lion, which I mentioned above as coming from Brasil, is in 

 like manner mixed very perceptibly to the eye with yellow 

 sulphuret of copper andiron. 



The groupes of crystals of endellion from Cornwall are 

 frequently accompanied with crystals of brown sulphuret of 

 zinc, and in several sulphuret of antimony is likewise ob- 

 served, commonly in fine needles, and frequently even ca- 

 pillary. 



In the compact state. 



In Uie com- The same pieces, that ificlude crystals of this substance 



pactstate. - }n c ornW all, include abo parts more or less large, in which 



it is in the compact state. When this occurs, its fracture is 



8 The plates to this article are unavoidably deferred lo our next 

 number. 



thus 



