686 



DEPARTMENT OF THE INTERIOR 



GROUP VII. 



2 GEORGE V., A. 1912 



No. of Analyses. 



Sid.. 

 Ti0 2 . 



A1 2 3 



Fe 2 3 



FeO.. 



MnO 



MgO. 



C*0 . 



Na 2 0. 



K 2 0.. 



H 2 0.. 



P 2 6 .. 



Plutonics. 



46 



Gabbro, 

 excluding 

 Olivine 

 Gabbro 

 (Osann). 



24 



47 



48 



Olivine 

 Gabbro 

 (Osann). 



17 



11 



Norite 

 excluding 

 Olivine 

 Norite 

 (Osann 



and 

 Walker). 



49 



50- 



17 



1- 



73 



18 



66 



2 



17 



8 



17 





•86 



6 



•48 



7 



16 



2 



■78 





•04 



1 



•29 





•08 

 •44 

 ■62 

 •35 

 •87 



11 

 ■22 

 •89 

 ■53 

 •71 



01 

 •17 



49 



Olivine 

 Norite 

 (Osann). 



10 



50 



Anortho- 



site (Osann 



and 



Washing- 

 ton). 



12 



38 



50 



04 





27 



28 



73 



1 



35 



1 



20 





32 



1 



91 



12 



18 



3 



02 





26 





34 





•40 

 15 

 •30 

 06 

 12 

 ■05 

 •25 

 •46 

 •67 

 •74 

 •75 

 05 



Calculated as Water-fkee. 



Si0 2 . 



Ti0 2 . 



A1 2 3 



Fe 2 3 



FeO. 



MnO 



MgO. 



CaO 



Na 2 



K 2 0. 



p 2 o 6 



50 



31 



46 



97 



50 60 



50 



51 



50 





85 



1 



18 



145 



2 



05 





18 



30 



17 



92 



18-81 



18 



32 



28 



2 



85 



3 



70 



2 37 





73 



1 



5 



89 



6 



24 



8 96 



10 



38 



1 





12 





17 



11 





20 





6 



73 



8 



96 



6-28 



5 



33 



1- 



10 



81 



11 



60 



7-97 



7 



93 



12 



2 



86 



2 



18 



256 



3 



19 



3 



1 



00 





79 



•72 



1 



02 







28 





29 



17 





34 





C78 



15 



S-51 



.■07 



.13 



05 



L-26 



!55 



1-70 



•75 



05 



Each sum = 100 00. 



