REPORT OF THE CHIEF ASTRONOMER 



361 



SESSIONAL PAPER No. 25a 



here include apatite, magnetite, and abundant titanite. Quartz seems to fail 

 entirely. The order of crystallization is the same as in the dominant pulaskite. 

 A large fresh specimen (No. 517) has been analyzed by Mr. Connor with 

 the following result : — 



Analysis of basic contact phase (monzonite), Coryell batholith. 



Mol. 



SiO. 



TiO'o 



A1,0, 



Fe 5 0, 



FeO 



MnO 



MgO 



CaO 



SrO 



BaO 



Na 2 



K 2 



H 5 at 110°C ., 

 H 2 above 110°C. 

 P,O s 



Sp. gr. 



The norm was calculated to be: — 



Ortboclase 



Albite 



Anorthite. 

 Nephelite. 

 Diopside . . 

 Olivine. . . 

 Magnetite. 

 Ilmenite. . 

 Apatite. . 

 Water.. . 



52-38 



873 



1-10 



014 



15-29 



150 



2-99 



019 



5-53 



■076 



•10 



001 



5-84 



146 



7-30 



130 



•15 



001 



-26 



002 



3-68 



060 



3-84 



040 



•21 





•63 





•75 



005 



10004 



2-847 



22-24 



28-30 



13-90 



1-70 



15-20 



9-44 



4-41 



2-13 



1-55 



The mode (Rosiwal method) is approximately :- 



Sodiferous orthoclaee and microperthite , 



Andesine 



Hornblende 



Augite 



Biotite 



Magnetite 



Titanite 



Apatite 



99-7J 



21-5 

 26-3 

 26-1 

 10-7 

 9-5 

 3-0 

 2-2 



100-i 



In the Norm classification the rock enters the sodipotassic subrang. monzo- 

 nose, in the domalkalic rang, monzonase, of the dosalane order, germanare. 

 According to the older classification the rock is a typical hornblende-augite- 

 biotite monzonite. 



