MINEEALS AND MINERAL LOCALITIES OF N. S. WALES. 43 



Tachylite. 



Tachylite is quite a common mineral on Mathers' Hill at 

 Inverell, where it occurs encrusting basalt and in loose pieces in 

 the surface soil. Colour black, brown, breaks into irregular 

 fragments with vitreous lustre on newly broken surfaces. Some 

 specimems shew spherulitic structure, and others are coated with 

 a dull bluish film. Also in basalt in road cutting at about seven 

 miles from Warialda on road to Yetman. At Kangaroo Flat, 

 near Emmaville, an immense boulder in the creek bed appears to 

 be entirely of tachylite. 



Zoisite. 



Zoisite occurs at upper Bingara at an old copper mine in Cooringra 

 Creek. The mineral is found in veins in a magnesian rock. 

 Crystallized in slender prisms which are massed together trans- 

 versely to direction of containing vein ; crystals all parallel, not 

 divergent, and without free terminations. Colour pale sulphur- 

 yellow ; silky lustre. Plentiful. 



Nantokite (Cu 2 C1 2 ). 

 Found forming small veins in haematite in the silver lodes of 

 Broken Hill. Colourless, transparent, lustre vitreous, crystalline, 

 showing brilliant cleavage planes where broken ; also disseminated 

 through the ferruginous material, and accompanied by much silica 

 in the form of minute quartz crystals. The small amount of 

 mineral available prevented the Sp. G. or hardness being deter- 

 mined. B. B. gives the characteristic flame of cuprous chloride 

 and on charcoal is reduced to metallic copper. Oxidises rapidly 

 on exposure. 



Dyscrasite (Antimonial Silver Ore). 

 Dyscrasite has been found in considerable quantities, accompany- 

 ing sternbergite, stromeyerite, and other silver ores in the Consols' 

 Mine at Broken Hill, in fact by far the greater portion of the so 

 called ' native silver ' taken out of that mine has been dyscrasite. 

 One large mass weighed upwards of twenty-two hundred weight, 

 and another discovered in 1891 weighed sixteen hundred weight. 

 This latter slug gave when smelted a return of fine silver at the 



