Alnoitic Rocks at Isle Cadieux, Que. 17 



The results of the investigation of equilibrium in mix- 

 tures of diopside, CaMgSi 2 6 , and nephelite, NaAlSi0 4 

 are given in Table III and in fig. 2, which, it must be 

 realized, is not a two-component diagram, though having 

 the same general form. It gives the names of the phases 

 present at various temperatures in mixtures whose total 

 composition can be expressed in varying proportions of 



Table III. 



Composition 



Nephelite Diopside Temp. Phases present 



10 90 1350 Glass and diopside 



10 90 1355 Glass only 



Glass, diopside and melilite 

 Glass, diopside and melilite 

 Glass and diopside 

 Glass and diopside 

 Glass and forsterite 

 Glass only 



Glass, diopside and melilite 

 Glass, diopside and melilite 

 Glass, diopside and olivine 

 Glass, diopside and olivine 

 Glass and olivine 

 Glass and olivine 

 Glass only 



Glass, melilite and olivine 

 Glass, melilite and olivine 

 Glass and olivine 

 Glass and olivine 

 Glass only 



Glass, melilite and olivine 



Glass, melilite and olivine 



Glass, nephelite, melilite and olivine 



Glass, nephelite, melilite and olivine 



Glass and olivine 



Glass only 



Glass, nephelite, melilite and olivine 

 Glass, nephelite, melilite and olivine 

 Glass and nephelite 

 Glass and nephelite 

 Glass only 



Glass (?) nephelite, melilite and olivine 

 Glass and nephelite 

 Glass and nephelite 

 Glass and carnegieite 



Am. Jour. Sci. — Fifth Series, Vol. Ill, No. 13. — January, 1922. 

 2 



20 



80 



1100 



20 



80 



1160 



20 



80 



1200 



20 



80 



1285 



20 



80 



1290 



20 



80 



1295 



35 



65 



1100 



35 



65 



1175 



35 



65 



1180 



35 



65 



1220 



35 



65 



1230 



35 



65 



1255 



35 



65 



1260 



50 



50 



1050 



50 



50 



1175 



50 



50 



1180 



50 



50 



1215 



50 



50 



1220 



60 



40 



1050 



60 



40 



1140 



60 



40 



1150 



60 



40 



1175 



60 



40 



1180 



60 



40 



1190 



70 



30 



1150 



70 



30 



1175 



70 



30 



1180 



70 



30 



1230 



70 



30 



1235 



80 



20 



1150 



80 



20 



1180 



80 



20 



1245 



80 



20 



1255 



