62 



PERCY ()UKNSEL 



Fig. i8. Iddingsite forming sharp outer borders around un<ihcrL(.l iili\ inc. 



Fig. 17. Elevation i 000 m. 3>Iasafuera. 



luo. I-'r(im ^pLLimen 



K -y^m 



■1 -^(''\-i^'' 





/ 





■J. 



ir^.-\ 



,\ 







Fig. 19. Phenocryst of laljradorite, traversed by a zeolitic matter. >; 170. From specimen 



Fig. 17. Masafuera. 



