Minerals of the Composition MgSiO z . 

 15 



423 



15000 

 (1460°) 



14000 



S 



.3 13000 



12000 



11000 

 (1145°) 



__ 



— s^^^""""^" 



I/_ TLS* 



1 ^ 



- t t 



r~[ 



~^\_ ~t 



T i 



7_~f 



\jt_ 



/ f 



jj 





T]T 



ft 



Pl 



Pn 



/ 



j 



"7 



-iJ 



41 



4T 



it 



it 



P 



^~ 



j 



J 



.1 



B 



t 



T 



f 



If 



r 



r 



i 





it 



Fig. 15. 



Time — 1 division — 1 minute. 



I = Orthorhoinbic amphibole (two curves). 

 II = Monocline pyroxene (two curves). 



