REPORT OF THE CHIEF ASTRONOMER 



287 



SESSIONAL PAPER No. 25a 



Table XVII. — Analyses of Rykert granite and related rod'. 



SiO 



TiO„.. 



Al 2 d 3 



Fe 2 3 



FeO 



MnO 



MgO 



CaO 



SrO 



BaO 



NsuO 



K„0 



H ? at 110°C. . 

 HoO above 110°C. 



p;o» 



Sp. gr. 



The calculated norm is 

 )uartz 



Orthoclase. . 



Albite 



Anorthite. . . 

 Corundum. . 

 Hypersthene. 

 Ilmenite.. .. 

 Magnetite. . 

 Apatite.. .. 

 Water 



1. 



la. 

 Mol. 



2. 



70-78 



1-180 



72-07 



•20 



-003 



•16 



15-72 



•154 



15-51 



•36 



•003 



•31 



1-61 



•022 



1-01 



•03 





tr. 



•46 



•011 



•35 



1-92 



•034 



1-93 



tr. 







•01 







3-48 



•056 



4-02 



5-23 



•055 



4-09 



•10 





•03 



•25 





•30 



•26 



•002 



•11 



100-41 



99-89 



2-654 







The mode (Rosiwal method) is approximately: 



Quartz 



Orthcclase and microcline of phenocrysts 



Orthoclase and microcline of ground-mass 



Oligoclase of phenocrysts 



Oligoclase of ground-mass 



Muscovite 



Biotite 



Magnetite 



Apatite 



Zircon.. .. 



Kaolin, calcite. . 



25-38 



30-58 



29-34 



8-90 



1-12 



3-21 



•46 



•70 



•62 



•35 



100-66 



35-5 



15-0 



17-5 



3-0 



17-7 



6-5 



30 



•6 



•4 



.3 



•5 



100-0 



According to the Norm classification the rock enters the sodipotassic 

 subrang, toscanose of the domalkalic rang, toscanase, in the persalane order 

 brittanare. 



