BY \V. F. PETTERD, C.M.Z.S. 31 



the Heazlewood district, and to a limited extent at other 

 localities. 



At the 600-feet level of the North Lyell Mine a mixture 

 of bornite and chalcocite occurs, which upon analysis gave 

 the following return ; — 



also 



Ozs. 



Discarding the 9' 2 per cent, of foreign matter, it appears 

 that the aggregate consisted of 60 per cent, of bornite 

 (Cu„ Fe S ) and 40 per cent, of chalcocite (Cur S). (R. 

 Sticht.) 



54. BouLANGERiTE fSulphantimonife of Lead). 



Occurs near Waratah with siderite and marmatite in a 

 lode, the gangue of which is fluorspar and quartz. The 

 samples vary in structure to some extent; they are com- 

 monly fibrous and compact, but may graduate to a form 

 which often has a granular structure. The lustre is invari- 

 ably silky and metallic. At Dundas it occurs both fibrous 

 and massive, and is often associated with jamesonite, 

 pyrites, cerussite, and massicot. At Block 291 it occurs 

 with arsenopyrite in a matrix of siderite. 



55. BouRNONiTE (Siilphantimonite of Lead and 



Copper). 



Occurs in patches near the junction of the slates and 

 granite on the south-east shores of King Island (Gould, 

 Pro. Roy. Soc. Tas., (1871). At Zeehan this mineral occurs 

 both in the massive state and as well-formed crystals inter- 

 mixed with quartz and galena. On a fribute of the Argent 

 Company some remarkably fine crystal groups have been 

 obtained, associated with siderite and another compound 



