446 DEPARTMENT OF THE INTERIOR 



2 GEORGE V., A. 1912 



Analysis of Remmel batkolith, Eastern phase. 



Mol. 



Si0 2 70-91 1-182 



Ti0 2 -20 -003 



ALA 16-18 -159 



Fe 2 d 3 -51 -003 



FeO 1-09 -015 



MnO -04 



MgO \ -37 -009 



CaO 2-92 -052 



BaO -10 -001 



Na,0 1-33 -021 



K 2 5-53 -059 



H 2 at 105°C -03 



H 2 above 105°C -12 



P 2 B -11 -001 



99-44 

 Sp.gr 2-654 



The norm was calculated to be: — 



Quartz 34-68 



Orthoclafie 32-80 



Albite .- 11-00 



Anorthite 14-73 



Corundum 2-75 



Hypersthene , 2-09 



Magnetite .70 



Ilmenite '46 



Apatite -31 



Water -15 



The mode (Rosiwal method) is roughly: — 



99-67 



Quartz . 34-3 



Orthoclase 374 



Andesine 25-5 



Biotite 2-3 



Magnetite -5 



Apatite, zircon, and epidote .3 



100-0 



In the Norm classification this rock is transitional between the, as yet, 

 unnamed dopotassic subrang of the alkalicalcic rang, coloradase, in the per- 

 salane order, britannare, and the corresponding, likewise unnamed subrang of 

 the order, columbare. In the older classification the rock has the chemical and 

 mineralogical composition of a common biotite granite. It is, however, impro- 

 bable that this type is an original product of crystallization from the batholithic 

 magma. 



The specific gravities of four fresh specimens of the less micaceous bands 

 of the Eastern phase vary from 2-644 to 2-654, averaging 2-651. These narrow 

 limits of variation agree with the microscopic study of the same specimens in 

 sb owing that the lighter bands are relatively uniform in composition. 



