226 TABLE 245. 



TRANSFORMATION AND MELTING TEMPERATURES OF LIME-ALUMINA- 

 SILICA COMPOUNDS AND EUTECTIC MIXTURES. 



The majority of these determinations are by G. A. Rankin. (Part unpublished.) 



Substance. 



% CaO A1 2 O 3 SiO s 



Transformation . 



Temp. 



CaSi0 8 

 CaSiOs 

 Ca 2 SiO 4 



Ca 3 Si 2 O 7 

 Ca 3 SiO 5 . 



Ca 3 Al 2 O 6 . 

 Ca 5 Al 6 Oi4 

 CaAl 2 O 4 



48.2 s 1 - 8 



48.2 51.8 



65- 35- 



65- 35- 



Al 2 SiO 6 . 

 CaAl 2 Si 2 O 8 

 Ca 2 Al 2 SiO 7 

 Ca 3 Al 2 SiO 8 



73-6 



62.2 

 47.8 

 35-4 

 24.8 



20. i 



40.8 

 50-9 



37.8 

 52.2 

 64.6 

 75.2 

 62.8 

 36.6 



37.2 



30.9 



26.4 



37.1 

 43.3 



22.0 



18.2 



Melting 



o to j8 and reverse 



Melting 



7 to and reverse 



to a and reverse 



Dissociation into Ca 2 SiC>4 and 



liquid 



Dissociation into Ca 2 SiO4 and 



CaO 



Dissociation into CaO and liquid 



Melting 



Melting 



Melting 



Melting 



Melting 



Melting 



Dissociation into Ca 2 SiO4+ 



Ca 2 Al 2 SiO7 and liquid . . 



1 540 -J-2 



1 2OO -[-2 



2130 ^-10 

 675 5 



I42O 4^-2 



H75 5 

 1900 4-5 



1535 =Es 



J 455 5 

 1600 - -5 

 1720 --10 

 1816 iio 



1550 2 



1590 4^2 

 1335 5 



EUTECTICS. 



EUTECTICS. 



Crystalline Phases. 



CaSiO 3 ,SiO 2 



Ca,SiO 3 



3CaO,2SiO 2 



Ca,SiO 4 



CaO. 



Al 2 SiO 6 ,SiO 2 



Al 2 SiO 5 ,Al 2 Oj 



CaAl 2 Si 2 O 8 



CaSiO 3 



CaAl 2 Si 2 O 8 



SiO 2 



CaAl 2 Si 2 O 8 



SiO 2 ,CaSiO 3 



Ca 2 Al 2 SiO 7 



Ca 2 SiO 4 



A1 2 3 



CaAl 2 Si 2 O 8 



CaAl 2 Si 2 8 



Al 2 SiO 5 ,SiO 2 



Ca 2 Al 2 SiO 7 



Ca 8 Al 10 Oi 8 



Ca 2 Al 2 SiO 7 



CaAl 2 O 4 



Ca 2 Al 2 SiO 7 



CaAl 2 4 



Ca 3 Al 10 Oi 8 



CaAl 2 Si 2 O 8 



Ca 2 Al 2 SiO 7 



Ca 2 Al 2 SiO 7 



Ca 8 Si 2 O 7 



CaSi0 3 



Ca2Al 2 SiO 7 



CaSiO 8 



%CaO A1 2 3 SiO 2 



37- 63. 



54-5 45-5 



67-S 32-5 



34.1 18.6 47.3 

 10.5 19.5 70. 



23.2 14.8 62. 

 49-6 23.7 26.7 



19-3 39-3 414 



9.8 19.8 70.4 



35. 50.8 14.2 



37-8 52.9 9.3 



37-5 53-2 9-3 



30.2 36.8 33. 



47.2 1 1.8 41. 



45-7 13-2 41-1 



Melting 

 Temp. 



Crystalline Phases. 



2065^ 



1610 

 1810 



1299 



1359 

 1165 



1545 

 1547 

 1345 

 1552 

 1512 



IS05 

 1385 

 1310 

 1316 



CaAl 2 Si 2 O 8 



Ca 2 Al 2 SiO 7 



CaSiO 3 



CaAl 2 Si 2 8 



Ca 2 Al 2 SiO 7 



A1 2 3 



Ca 2 SiO 4 



CaAl 2 O 4 



Ca 5 Al 6 14 



%CaO A1 2 O 3 SiO 2 



38. 20. 42. 

 29-2 39- 3!-8 

 49-5 43-7 6.8 



Melting 

 Temp. 



1265 



1780 



1335 



QUINTUPLE POINTS. 



Ca 2 Al 2 SiO 7 



Ca 3 SiO 7 



Ca 2 SiO 4 



Ca 2 Al 2 SiO 7 



Ca 2 SiO 4 



CaAl 2 O 4 



CaAl 2 Si 2 O 8 



A1 2 O 3 



Al 2 SiO 6 



Ca 2 Al 2 SiO 7 

 A1 2 3 



48.2 11.9 39.9 



48.3 42. 9.7 



IS- 6 36.5 47-9 



31.2 44.5 24.3 



1335 

 1380 

 1512 

 H7S 



QUADRUPLE POINTS. 



3CaO.2SiO 2 

 2CaO.SiO 2 



55-5 44-5 



I47S 



of S 



SMITHSONIAN TABLES. 



ints is S to 10 units. Geophysical Laboratory. See also Day and Sosman, Am. J. 



