PITCHBLENDE PROBABLY OCCURRING IN NEW SOUTH WALES. 31 



of sulphur present, but it is very probable that some of the 

 bismuth, copper, and possibly some of the lead may be there 

 as sulphides. 



uo 3 



... 



... 69*0 per cent. 



uo 2 



... 



... 8*8 



PbO 



... 



... 6*0 



Mn 3 4 , 



ZuO? ... 



... 4*2 



Fe 2 O s 



... 



... 2*7 



CaO 



... 



... 3*7 



Insol. 



... 



... 2'4 



Si0 2 



... 



•1 



Bi 2 3 



... 



•4 



CuO 



... 



•1 



As 2 3 



... 



... trace 



MgO 



... 



... trace 



H 2 at 130° ... 



... '69 







98*1 



Density 



at 23°... 



7*65 gm./cub. cent, 



No rare earths detected. 



Discussion of the Analysis.— If we compare the results 

 of this analysis with one made by Hillebrand 1 of an altered 

 and crumbled pitchblende from Johanngeorgenstadt in 

 Saxony, we see in certain characteristics a close resem- 

 blance. The first analysis below is the one already given 

 of the New South Wales mineral, the other is the Saxony 

 mineral : 



S.G. U0 3 U0 2 PbO CaO Fe 2 O s H 2 



N.S.W. 7*6 69*0 + 8'8 = 76*8 

 J. 6*98 59*3 + 22*3 = 81*6 



OuO Bi 2 O s Si0 2 MgO 

 N.S.W. -1 *4 '05 tr. 



J. '17 *75 -50 '17 



1 Am. Journ, Sc, xlii, 390 (1891). 



6'0 3*7 2'7 



•7 



6*4 1"0 '2 



3*2 



tr. As 2 3 





2*3 As 2 O s 





