89 



5200, 4355, Gundagai : slickeusided surfaces stained a brilliant Case 73. 

 green by salts of cliromium. 



9539, Quilter's Mine (Gobarralong), showing octahedral faces 

 ■of crystallised chromite. 



5299, Emu Mine : periJotite, the rock from which the serpen- 

 tine appears to have been derived by alteration. 



TUNGSTEN. 



An alloy of tungsten and iron is used in the preparation of 



■certain varieties of steel, it having been found that the addition 



of small proportions of tungsten produces a steel of great 



toughness. It is produced from two minerals only, viz., 



sclieelite and loolfram. 



Tungstate of lime: a white mineral, usually found massive, Scheelite 

 ■characterised by its great density. Specific gravity, 6.* 



Seheelite has been found in quantity in the neighbourhood 

 of Hillgrove only, where it occurs as narrow veins traversing 

 granite. 



9278 : from a 4-inch vein traversing granite. 



3972 : rich ore containing 57| per cent, of tungstic acid. 



9274, and others : low-grade ores from the Hopetoun Mine, 

 that can be concentrated up to market requirements. 



928, Gava Falls, near Hillgrove. 



9429 and others : Frogmore, where it also occurs in granite 



country. 



Tiiena. Queanbeyan ; Hanging E-ock. 



A green variety of seheelite containing copper. Cupro- 



scheelile 

 5585, Peelwood. In this ore it is intimately associated with 

 stolzite (lead tungstate) and ordinary scbeelite. 



* The specific gravity of seheelite is m\xch higher than that of barytes, a mineral some- 

 times mistaken for it. 



