368 



DEPARTMENT OF THE INTERIOR 



2 GEORGE V, A. 1912 



Table XXV. — Analyses \of missaurite. 



1. la. 2. 

 Mol. 



Si0 2 42-31 -705. 46-06 



Ti0 2 2-00 -025 -73 



A1 2 0, 11-40 -112 10-01 



Fe 2 0., 407 -026 3-17 



FeO. 6-11 -085 5-61 



MivO -11 -001 tr. 



MgO , 11-31 -283 14-74 



CaO 11-02 -196 10-55 



SrO -16 -002 -20 



BaO -64 -004 -32 



Na 2 -82 -013 1-31 



K 2 3-69 -039 5-14 



H,0 (at 110°C) 2-28 ....\ t ,, 



H 2 (above 110°C) 2-72 ...J l '** 



P 2 0, 1-44 -010 -21 



SO a ; -05 



Cr,0, -05 



CI.. -03 



C0 2 tr 



100-13 99-57 



Sp. gr 2-817 



The calculated norm is : — 



Orthoclase 21-68 



Nephelite 3-39 



Anorthite 16-68 



Diopside 24-57 



Olivine 15.16 



Magnetite 603 



Ilmenite 3-80 



Apatite 310 



Water 500 



99-41 

 In the Norm classification the rock enters the dopotassic subrang, 



absarokose, of the alkalicalcic rang, camptonase, in the salfemane order, 



gallare. 



The actual mineral composition of the dike (determined by the Rosiwal 



method) and that of the type missourite agree with the chemical comparison 



in indicating the place of the Record mountain dike in the missourites of the 



prevailing classification. 



Augite . . 

 Biotite . . 

 Leucite.. 

 Olivine. . 

 Analcite. 

 Zeolites.. 

 Iron Ore 



Shonkin Stock, 

 Montana. 



( by weight. ) 

 % 



1000 



Augite 



Biotite 



Pseudoleucite, etc 



Magnetite 



Apatite 



Record 

 Mt. Dike. 



by weight. ) 



100-0 



