54 CATALOGUE OF MINERALS ; 
Arsenical pyrites, though frequently accompanying other auri- 
ferous sulphides in this colony, is not a mineral so highly to be 
regarded here for its gold-bearing properties as it is in other 
countries, such as Brazil, Nova Scotia, or even California. 
CHALCOSTIBNITE — ANTIMONIAL CoppER—Comp. sulphide of 
antimony and copper. 
Mr. R. L. Jack mentions the occurrence of a grey sulphide of 
copper and antimony with cuprite in a copper lode on the north 
bank of Pumpkin Gully, and also in the Rainbow lode, on the fall 
of Cone Creek, a tributary of Duck Creek, both these localities 
being in the Cloncurry district. 
TETRAHEDRITE—FAHLERZ—Comp. 4 Cu S + Sb, S,, but very 
variable. 
A very rich ore, cut in the vertical shaft of the Ravenswood 
Great Extended silver mine in the 650 ft. level, is probably an 
argentiferous tetrahedrite, perhaps containing sphalerite in very 
intimate association. A sample of this assayed by me gave a 
value of 2,384 ozs. 10 dwts. of silver per ton. ‘The following is an 
analysis of the ore by Mr. A. W. Clarke, the silver determination 
being made by me by cupellation :— 
Copper . - 2 . 12.67 per cent. 
Antimony : - 2 21,35 deny, 
Silver : : : ; 2B ass 
Iron ; ; - TOL lis 
Zinc : : : BS ey) 
Sulphur : ,) esas eae 
Silica : 3 : ; B86.) 3 
101.86 
An analysis of a different sample by Mr. Murray, analyst to the 
Ravenswood Great Extended mine, gave :— 
Copper . : - . 16.25 per cent. 
Antimony : ; ; 26 4Guae, 
Silver. F = Sy TS-3500nee 
Iron - - 3 : 3:49 Gs 
Zinc ; ; A ; 3175/1 
Sulphur . : : SP Ke ee 
Siliceous matter. . 7-gt aes 
99-47 
Tetrahedrite is also said to occur in the Mount Orange copper 
mine, Nebo goldfield, and at Cloncurry. 
