90 



Case 73- 7702, Upper Timby, Teoval : picked portions were foun<I to 



contain 73 per cent, of tungstic acid, 14 of lime, and 7 of 

 cuprous oxide. 



8395, Back Creek. 



9344, Orange : assaying 68"35 per cent, of tungstic acid, and 

 2"56 of metallic copper. 



Wolfram. ^j^q most abundant and most valuable ore of tungstic acid. 



A very heavy black mineral (specific gravity, between 7 and 8), 

 readily cleaving into highly lustrous flakes. It is easily scratched 

 vpith a knife, yielding a reddish-brown streak.* It occurs as 

 irregular patches in granite, and frequently has a quartz gangue. 

 "While principally found in New England, it also occurs in 

 numerous other localities, but never in any quantity. 



913, New England : showing excellent cleavage surfaces with 

 good vitreous lustre. 



9093, 9544, and 894: crystals of wolfram from the Wild 

 Kate, Torrington, and other claims near Deepwater. Comparison 

 should be made with the titaniferous iron ore, ilmenite, from 

 Deepwater, exhibited at the end of this show-case. Wolfram 

 and ilmenite are sometimes very much alike. 



9566, 10 miles north-east of Deepwater : coating quartz 

 crystals. 



9306, Stony Creek, Eockley. 



921 and others, Barrier Range. 



7732, near Erogmore, where a small quantity has been mined. 



7675, Talgogrin. 



* Wolfram may be readily distinguished from certain other minerals by its physical 

 characters : — 





Scratched with knife. 



Colour of Powder. 



Wolfram 









With great difficulty 



No 







Buff. 





No 



Almost white. 









