32 



NEW YORK STATE MUSEUM 



Chemical composition, norm, and mode 



Excellent exposures of what is regarded as very typical gabbro 

 occur in the railroad cut i}i miles south of The Glen. This rock 

 has been analyzed for the writer by Prof. E. W. Morley. 



Table 5 

 Chemical composition and norm 





a 



(U 







< 







Ah 







< 



^ 



^ 

 S 



0. 

 



Q 



a 







SiOa 



a6 /in 



•773 

 • 139 

 .013 

 .182 

 .124 

 .172 

 .050 

 .012 











72 

 12 



258 

 43 



168 

 84 





152 



69 



54 



A1203 



14 

 2 



13 

 4 

 9 

 3 

 I 



3 



T 



17 



03 



12 



94 

 65 

 14 

 12 

 02 

 25 

 03 

 80 



15 

 44 

 14 

 18 

 10 

 04 











Fe203 











13 

 13 









FeO 



38 







2 









68 



69 





MgO 



CaO 









108 





20 



7 





12 



43 



84 







NajO 







K,0 













H2O + 











...!...... 









H2O— 















, ! 



... 1 ... 1 ... . 









TiO, 



.038 

 .006 

 .004 

 .006 

 .005 

 .001 

 .001 

 .002 

 .000 



38 















1 





P»0» 



6 









1 











CI 



15 







. _ . 













MnO 









6 







S. 









5 



1 



j 





J 



BaO 

















I 

 I 







SrO 























P.. 



















' 





ZrOj 





















































99 77 





Orth 6.67] 



Alb... 22.53 



Anor 23.35 



NaCl 82 



Ilm 578 



Mag 3.02 



Pyr 24 



Apat 2 . 02 



Diop 17 -53 



Hyper 8.02 



Oliv 9.32 



H20+Zr02. .32 J 



99.62 



Sal.= 53.37 Class, 



Sal. ^ 53-37 ^5-^3 

 Fem. 45.93 3 5 



III, Salfemane 



QL 



Order, p 



'■ <— = 5, Gallare 



52.55 7 



• Fem.= 45.93 Rang, 



K20^+Na20i 



Subrang, 



CaO^ 



K2O1 

 NazO^ 



84 3 5 



3, Camptonase 



— <— >— = 4, Camptonose 

 50 5 7 



i 



