18 N. L. Bowen — Genetic Features of 



diopside and nephelite, but the composition of some of 

 the individual phases can not be so expressed. 14 



Fig. 2. 



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14 In Table III and fig. 2 the group name, olivine, is used because the 

 olivine formed at lower temperatures may be monticellite, though it is cer- 

 tainly forsterite at higher temperatures. 



