MINERAL COMPOSITION OF DIORITES. 



109 



groups, Ila, 116, He. The tables presenting the results of this part of the 

 work have a different form and are arranged separately for each subdivision. 

 They are Tables V, VI, and VII. 



Table V. — Mineralogical variation among the diorites of Group Ila. 



i 



= 



5 



a 

 a 



9 



3 



'o 

 o 

 ft 

 'Jl 



© 



as 



u 



Ph 



Amount of quartz. 



Relative amount of pyroxene and 

 hornblende. 



Relative amount of pyrox- 

 ene, hornblende, and bio- 

 tite. 



Little. 



Mod- 

 erate. 



Con- 

 sider- 

 able. 



Much. 



P- 



p>h. 



p=h. 



P<h. 



ft, 



(ph)J(ph)>b 



(pft)=6 



iph)<b. 



266 



267 



268 



269 



270 



271 



272 



273 



274 



275 



276 



277 



278 



279 



280 



281 



282 



283 



284 



285 



286 



287 



288 



289 



290 



291 



294 



295 



296 



297 



298 



299 



300 



57.38 



266 







266 

 267 

 268 











9fifl 







267 

 268 

 269 

 270 

 271 

 72 

















267 

 268 

 269 



270 

































269 























270 

























271 



273 

 274 















61.22 

 58.05 

 56.33 



2 

 273 

 274 









272 









272 



2"79 



















274 







275 







275 

 276 

 277 

 278 







275 

 276 





58.10 





276 















277 

 278 



























278 









279 

 280 

 2 











279 

 280 

 281 



























280 

 il 



282 



58.11 

 58.87 







SI 













2! 





282 







282 







2 



S3 









28 

















2 



a 













55.64 





285 

 286 







285 









285 











286 



28 

 288 



2; 







28 







287 

 288 



2; 

 290 

 291 











7 





287 

 288 





























19 









9 

 *290 



.... 



28 















290 

 1 

















29 

 294 

 5 

 296 



.... 



2S 

 294 

 29 



56.28 



53.72 

 55. 23 



294 



296 

 297 

 298 















2! 



5 









1 



21 





















296 















*297 



.... 



297 













298 





298 





299 

 3C 











299 



























31 









i 







1 











1 













* The hornblende in these rocks is in part secondary ; pyroxene may have been present originally. 



