BANAKITE. 



347 



very well be a coarser-grained portion of the one just described, is whiter 

 in color and coarser grained, and is full of irregularly shaped tablets of 

 biotite, from 1 to 3 mm. broad. It has the same mineral composition as the 

 first one, except that biotite is more abundant, and some of the feldspars 

 are 2 mm. long. 



BAXAKITE. 



The most feldspathic rocks of this series, which occur as dikes asso- 

 ciated with dikes of shoshonite and absarokite, are not so numerous. A 

 larger proportion of them, however, have been analyzed. They occur in 

 Crandall Basin, in Ishawooa Canyon, and near the head of Stinkingwater 

 River. A leucite-bearing variety forms a lava sheet near Beaverdam Creek. 

 Their chemical composition is shown by the analyses in the accompanying 



table: 



Analyses of banakite and quartz-banakite. 



Constituent. 



1 



2 



3 



4 



5a 



5b 



6 



7 





51.82 



.71 



16.75 



4.56 



3.36 



.23 



52.63 



.81 



16.87 



4.52 



3.11 



.10 



51.46 



.83 



18.32 



4.61 



2.71 



.17 



52.33 



.71 



18.70 



4.95 



1.83 



.03 



.14 



52.93 



.72 

 19. 67 



3.07 



3.50 



.15 



51.56 



.65 



21.00 



5.17 



2.76 



Trace. 



57.29 



.72 



18.45 



4.38 



1.20 



Trace. 



.12 



60.89 

 .49 



17.14 



3.32 



.95 



.09 



.19 





AL.O3 



Fe Os 



FeO 



MnO 







.26 

 4.03 

 4.94 

 3.91 

 5.02 



.29 

 3.69 



4.77 

 3.86 

 5.17 





.21 

 2.88 

 4.69 

 4.20 

 4.75 





MeO --- 



2.91 

 6.03 

 4.11 

 4.48 



2.69 

 4.71 

 4.51 

 5. 45 



2.52 



4.83 



4.37 



4.13 



.13 



.69 



.21 



2.27 



2.08 

 3.57 

 4.43 

 5.43 



1.16 



3.58 

 4.54 

 5.71 



CaO 





Pj0 6 



.52 



.63 



.86 



.81 



.59 



.46 



.27 





H»0 



3.97 



3.65 



3.89 



3.45 



2.73 



2.18 



1.61 



Total 



100. 08 



100. 10 



100. 38 



100. 31 



100. 09 



100. 29 



100. 31 



99.94 





1. BanaMte, dike, head of Lamar River. Analyst, L. G. Eakins. (1309.) 



2. Bauakite, dike, Hoodoo Mountain. Analyst, L. G. Eakins. (1296.) 



3. Banakite, dike, Ishawooa Canyon. Analyst, L. G. Eakins. (1699.) 



4. Banakite, dike, near head of Stinkingwater River. Analyst, W. H. Melville. (1466.) 



5a. Leucite-banakite, lava sheet, southeast fork of Beaverdam Creek. Analyst, L. G. Eakins. 



(1643.) 



56. Leucite-banakite, lava sheet, southeast fork of Beaverdam Creek. Analyst, J. E. Whitfield. 



(1643.) 

 6. 



Quartz-banakite, dike, near head of Stinkingwater River. Analyst, W. H. Melville. (1463.) 

 Quartz-banakite, dike, near head of Stinkingwater River. Analyst, W. H. Melville. (1469.) 



