SiO^.. 

 TiO^ . 



Fe,03 

 FeO . 

 MnO. 

 CaO . 

 BaO.. 

 MgO 

 Na^O . 

 KjO . 

 P.O. . 

 CrjOa 

 F .... 

 CI ... 



PERCY QUEXSEL 



Analyses calculated as water free. 



I 



II 



III 



IV ! V 



VI 



VII 



46.21 



3-49 

 16.03 

 2.76 

 8.86 

 0.23 

 10.53 



6.55 

 362 

 1.36 

 0.32 



46.68 



3-85 

 16.75 



5-55 



7-34 



o 24 



10.78 



4.64 

 2.98 



47-83 

 3.12 



1372 



5-49 



6.90 



o.i I 



10.33 



9-15 

 2-39 

 0.65 

 o.so 



48.60 



3-49 

 16.57 



4.84 



7.29 



0.18 



10.82 



4.50 

 2.65 

 0.69 

 0-37 



47-36 

 3-3^ 



16.99 

 4.38 

 8.32 

 0.18 

 9.01 

 0.01 

 6.62 

 2.85 



0.37 

 0.47 



0.15 

 0.08 



43-34 

 1.03 

 8.48 

 2.91 



10.99 

 0.13 

 5-03 



25.91 



1-33 

 0.58 

 0.19 



0.08 



45-27 



2.79 



18.02 



7-15 

 7.38 

 0.07 



6.34 



8.96 

 2.64 

 0.77 

 0.28 

 0.14 



o.iq 



VIII 



<^3-3(} 

 0.28 



18.62 

 2.78 

 1.02 

 0.09 

 1.68 



1.38 

 6.76 

 3.81 

 0.18 



0.04 



Molecular proportions (>' 100). 



