Andersen — System Anorthite-Forsterite-Silica. 429 



that the amount of solid, of mean composition a\ separated 



between a and m is equal to 100 x '- , per cent of a and the 

 x a m x 



amount of remaining liquid, of composition m, 100 x — — per 

 cent. 



Fig. 5. 



C 



m 



> 



<- 



> 



<■ 



B 



D 



The simple principles now outlined concerning the crystalli- 

 zation in ternary systems hold true for all types of systems 

 without solid solutions.* By applying these principles the 

 state of equilibrium for any melt of a system whose liquidus is 

 known can be expressed in quantitative terms. In other 

 words, the compositions and relative amounts of the different 

 phases at various temperatures can be calculated for all melts 

 of the system. 



* And with small modifications also for systems with solid solutions. 



