i6o 



H. W. TURNER 



made in the same way as for the biotite-granite. The biotite in 

 the aplites being similar to that of the biotite-granite, it is sup- 

 posed to have the same chemical composition. The result of 

 the computation is as follows. 



COMPOSITION OF THE GRANODIORITE-APLITE 



Not accounted for .0167 



ANALYSES OF POTASH APLITES 



Si0 2 



Ti0 3 



A1 2 3 



Cr 2 3 



Fe 2 3 



FeO 



MnO 



NiO 



CaO 



SrO 



BaO 



MgO 



K 2 



Na 2 



Li 8 



H g O below no e 

 H 2 above no 



P 2 5 



CO, 



Total. 



159 . 



Nevada city 



77-05 : 



•73 



5-o6 

 3-43 



No. 227 S. N. 



75-97 : 

 .09 



13-07 



none 



.61 



•39 



trace 



none 



1.49 



•03 



.14 



•M 



5-02 



2.51 



trace 



.14 



.24 



trace 



none 



100.44 



No. 161 S. N. 



76.03 : 



•07 

 13-39 



•3i 

 trace 



1.28 



trace 



.04 



•05 



5.18 



2.98 



none 



•15 



•34 



■03 



100.33 



Average of 

 227 and 161 



76.00 



.08 



13-23 



•54 



•35 



trace 



1.38 



.02 



.09 



.09 



5-40 



2.74 



1.49 



.14 

 .29 

 .02 



100.37 



proportions 

 of the 



I.2667 

 .0010 



.1297 



.0034 



.0049 



.0266 



.0022 



•0574 

 .0442 



.Ol6l 

 .OOOI4 



1-5523 



Analyst : ' Stokes. 2 Hillebrand. 





