444 



DEPARTMENT OF TEE INTERIOR 



2 GEORGE V., A. 1912 



foils reaching 1 cm. or more in diameter, are the only phenocrysts. Otherwise 

 the structure of the rock, though somewhat obscured by crushing, seems origin- 

 ally to have been the normal eugranitic. A deep brownish-green hornblende, 

 quartz, andesine (averaging Ab 5 An 3 ), and orthoclase are the other essential 

 constituents. Titanite, magnetite, and apatite are the "accessories. Except for 

 the often unusually perfect idiomorphism of the biotite the rock has, thus, the 

 general habit of a common granodiorite. 



Mr. Connor's analysis (specimen No. 1405) afforded the following result: — 



Analysis of Remmel batholith, Western phase. 



SiO„ 



Tio; 



A-LA 



Fe 2 0,.. 



FeO. 



MnO 



MgO. 



CaO 



SrO 



BaO 



Na,0 



K,0 



H„0 at 105°C.. . 

 HoO above J05°C. 



p,o, 



Sp. gr 



The norm was calculated to be : — 



Quartz 



Orthoclase. . 



Albite 



Anorthite. . . 

 Corundum.. 

 Hypersthene. 

 Magnetite.. . 

 Ilmenite.. .. 

 Apatite.. .. 

 Water 



2-721 



Mol. 



63-30 1 



055 



•50 



006 



17-64 



173 



1-58 



010 



3-08 



043 



•47 



007 



1-23 



031 



5-03 



089 



none. 





.05 





4-56 



074 



1-16 



013 



•14 





•51 





•27 



002 



99-52 





18-24 



7-23 



38-78 



22-80 



•40 



7-59 



2-32 



•79 



•62 



•65 



99-42 



The mode (Rosiwal method) is approximately: — 



Quartz 27-0 



Orthoclase 7-2 



Andesine 50-7 



Biotite 5.7 



Hornblende 4.3 



Magnetite 3.8 



Titanite .6 



Apatite .5 



Epidote and zircon .2 



100-0 



