1902] Barlow Nrpheline Rocks on Ice River, B.C. 



75 



For purposes of comparison the followinor table of a 

 are given of the ijolites from the various localities at present 

 Analyses of ijolites from several localities. 



Si O. 39250 



Al., O, 16.012 



Fe O3 

 Fe' 



Ms- O 



4-313 



.... 9.640 



'& - 4242 



Ca O 13423 



Na,0 4-9I7 



Kg^O 2.256 



H. O (i-nit) f 



H.. O (i.o) )-79/ 



Ti' O., 



Mn O' 



P., O5 



4.019 

 49 



o. 



0.905 



2 ' 



41-75 

 17.09 



6.35 



3-4' 



4.71 



14 57 

 6. 17 



3-98 

 0.62 

 o 28 

 0.58 

 trace 

 1.09 



.) 



42 



19 



4 

 2 



I 



1 1 



9 



} 



I 



o 

 I 



79 

 89 



39 



33 

 87 



76 



31 

 67 



99 



70 



41 

 70 



nalyses 

 known. 



4'^ 

 46.63 



15-03 

 5-9' 

 5 09 



3-47 

 1 1.23 



8.16 



i.q6 



o. 



35 



1. 12 

 trace 



q8.8i 



99-57 



100.123 100.60 



I Ijolite, Ice river, British Columbia. 



2 ,, Magnet Cove, Arkansas, U.S.A. 



3 ,, Mt. liwaara, Finland. 



4 ,, Kaljokthal, Umptek, Kola. 



The hydronephelite which is such an important mineral con- 

 stituent of the biotite-asgirine-ijolite was separated by means of 

 Thoulet's solution, the specific gravity of the powder thus ascer- 

 tained varying from 2.243 2.275. ^n analysis of this powder 

 was made by Mr. R. A. A. Johnston, which shows it to have the 

 composition given under i in the following table. 



A nalyses of Hydronephelite and Ranite. 



42.80 

 28.50 



0.34 



1.90 



i4-33 

 0.30 



10.81 



Spec. grav. . . 2.24^ 



98.98 



-2.275 



38-99 

 33-62 



0.07 

 13.07 



1.12 

 12.98 



9985 

 2.263 



3-^ 

 39. 2 1 



31-79 

 0.57 

 5-07 



11-55 



11.71 



^ Bull. Geol. Soc. Am., Vo\. 11, 1900. No. l\\ p. 399. 

 ^, Rosenbusch : Elem. Gosteinlehre, p. 180, 



* Ann. Rep. Geol. Siirv. Can., Vol. XII, p. 13R. 

 ' Dana's Mineralogy. 1892, p. 609. 



