Rankin an d Wrigh t — Ternary System Ca 0-A l 2 O-Si O n . 79 



E. Quintuple Points other than Eutectics. 



Crystalline 



Weight percentage 



Temp. 



Phases 



CaO 



A1 2 3 



Si0 2 



CaO.Al a O s .2SiO g ) 



Al 2 O s 



Al 2 3 \Si0. 2 ) 



15-6 



36-5 



47*9 



1512°±5° 



2CaO.Al 0,.SiO„") 



£2CaO"SiO„ " (■ 

 CaO.Al,0 3 " J 



48'3 



42- 



9-7 



1380°±5° 



2CaO.Al 2 3 .Si0 ) 

 3Ca0.2Si0 o " 5- 

 £2CaO.Si0 2 ) 



48-2 



11*9 



39-9 



1335°±5° 



3Ca0.5Al 2 3 *) 



2CaO.Al 2 3 .Si0 2 [ 



A1 2 3 ) 



31-2 



44-5 



24-3 



1475°±5° 



3CaO.Si0 2 ) 

 3CaO.Al 2 3 [ 

 a2CaO.Si0 2 ) 



58-3 



33' 



8-7 



1455°±5° 



CaO ) 

 3Ca0.Si0 o [ 

 3CaO.Al 2 6 3 ) 



59-7 



32-8 



7-5 



1470° ±5° 



CaO ) 

 a2CaO.SiO„ [ 

 3CaO.SiO„ ) 



68'4 



9-2 



22-4 



1900° ±20° 



In closing this record of a long and, in many of its phases, 

 very exacting investigation, the authors take especial pleasure 

 in expressing their gratitude to Prof. W. D. Bancroft for many 

 helpful suggestions, and to their colleagues, Dr. John John- 

 ston, Mr. E. S. Shepherd, and Mr. J. B. Ferguson, for most 

 valuable assistance which was often asked and always freely 

 given. 



Geophysical Laboratory, 



Carnegie Institution of Washington, 

 Washington, D.C. 



