Buddington — Natural and Synthetic Melilites. o~ 



I-670 

 •660 



% 



^ /-650 



I 



^ /-640 





/■<530 



■5 S 



o zo 



<?CaC-Al 2 CyJLO a 



Fig. 6. 



I-07O 

 1-660 

 t-650 

 l-64-O 

 I-6JO 

 1-620 



I-6IO 



-4-0 GG -" . IOO 



T- PERCENT goJJCaO'A^OjJ^iO/j 



G^»>' 









"^j^^-< 



**^GO 









^ Ss3 ^ c \^^ 





























lo/JNa 2 0-AI 2 0j -JJ5i O^J 



6. — Curves for refractive indices plotted against composition in "weight 

 percent for mixtures crystallized above 1000° and below the point of 

 dissociation or the beginning of melting. 



Fig. 7. 



2 C-r3^L 2 G 3 e SiQ 



2C*0*MsO'2Si& 



40 



WT PERCENT 



90[3CA0«AL 2 eV3Si9 2 J 

 10[3Ha 2 0-Al 2 3 -3Si0 2 ] 



7. — Triangular concentration diagram showing compositions of prepara- 

 tions investigated and the isotherms for the temperatures of complete 

 melting. 



