46 



blackening on exposure to light ; occurs massive or encrusting, 

 but at Broken Hill frequently found in crystalline spongy 

 masses, or in definite crystals belonging to the cubic system. 

 Broken Hill, Billagoe, Cobar, Silverton. 



Dtsceasite, silver antimonide (silver, 78 per cent, or more) : 

 Eather soft ; silver-Avhite in colour ; uneven fracture ; often 

 taken for native silver. Consols Mine, Broken Hill. 



AnGEijirTiTE, silver sulphide (silver, 87 per cent.) : A soft, black 

 mineral, perfectly sectile. "Wollomombi, Drake. 



PxEABGTRiTE, sulphide and antimonide of silver (silver, 60 per 

 cent.) — Colour black, sometimes reddish. The lustre of the 

 mineral and the cochineal-red colour of the powder are of great 

 assistance in recognising it. Burragorang, Consols Mine (Broken 

 Hill), Drysdale, Eockvale and other districts in the vicinity. It 

 occurs in quantity at Eockvale only ; crystals are very rare. 



Proustitk, sulphide and arsenide of silver (silver, 65 per cent.) : 

 Yery similar to pyrargyrite. Kockvale, Eivertree. 



SiEPHAT^fiTE, sulphide and antimonide of silver (silver, 68 per 

 cent.) : Black in both colour and streak. Eockvale, Consols 

 Mine (Broken Hill). 



Case 58. Wollomombi. — 8342-8348, ores consisting essentially of quartz, 



Northern with small quantities of disseminated sulphides ; the silver con- 

 ^District 



tents are sometimes very considerable — 386 oz. per ton in 8347. 



Silver sulphide {cir^entite) is sometimes present (8342), but is 



difficult to recognise. From Kessler's Mine some richly 



argentiferous siliceous and arsenical pyrites is exhibited. 8608, 



from a narrow vein in granite, contains a little native silver. 



Tilbuster. — 8604, galena ore occurring in slate country at the 

 Mary Ann Silver-mine. From the hanging-wall of this mine a 

 pretty formation of ruby silver has been obtained, the mineral, 

 which is of a deep puce colour, occui-ring in fern-like encrus- 

 tations (8605). 



