and Density of Some Crystallized Silicates. 



269 



Table III. 



8 5 



Pn 



Pn 



N Li 



N Na 



N Th 





D 



100-00 



o-oo 



000 



1-4567 



1-4589 



1-4612 



•0045 



2-213 









1-4565 



1-4592 



1-4612 



•0047 





46-50 



50-00 



3-50 



1-6365 



1-6405 



1-6446 



•0081 



2954 









1-6375 



1-6416 



1-6453 



•0078 



2-952 



45-00 



40-00 



15-00 



1-6349 



1-6391 



1-6427 



•0078 



2-966 









1-6352 



1-6393 



1-6430 



•0078 



2-969 



50-20 



24 -SO 



25-00 



1-6182 



1-6224 



1-6262 



•0080 



2-920 









1-6185 



1-6226 



1-6259 



•0074 



2-921 



2-7 



I'S 



Z-5 



Fig. 3. 









































/ 





































/ 



/ 





































? 



/ 







































/ 





































/ 



/ 





































X 







































/ 

































/ 



/ 



































/ 



* 





































/ 



s 



































2 



/ 



































\y 





























































y\ 



































\/ 



































/ \ i 

































Z-4 



x 10 ZO 30 40 SO 60 70 BO 90 100 



Albite Anorthite 



In birefraeting minerals the mean index of refraction was 

 taken 



// =z or n = '- 



3 3 



