270 

 Chemical Analyses. 



RESULTS OF ANALYSES. 





1 



2 



3 



Mean. 



SiO, ... 





38-69 



38-63 



38*66 



Al 2 6 3 ... 



1738 



17-28 



1733 



17-33 



Fe 2 3 ... 



9-85 



9-82 



9-88 



9-85 



FeO ... 



5'55 



5-64 



5-60 



5-59 



MgO ... 



15-04 



14-90 



14-97 



14-97 



Cat) ... 



nil 



nil 



nil 



nil 



Na.O ... 



__ 



— 



2-76 



2-76 



K 2 ... 





— 



o-59 



5'59 



h;o ... 



. — 



— 



2-47 



2-47* 



Ti0 2 ... 



0-64t 0'62f 



i-94: 



1-96: 



Tl0 10-03§ 



iiu n 1-3211 



Cr 2 3 ... 





0-61 



061 



061 



MnO ... 



- — 



— 



trace 



trace 



Fl 



— 



— 



0-77 



0-77 



v 2 o 5 ... 



— 



— 



trace 



trace 



Total 



Oxygen equivalent 



99-95 

 0-32 



99-63 



Corrected Total 

 Multiplying factor for adjustment ... 1013 



*Loss on ignition chiefly. fTwo separate results of combined TiO : 



rutile. 



Total titanium. 



§ Chemically comt 



>ined. 



j| Included 





CORRECTED ANALYSIS, 





after 



eliminating included ruti] 



e. , 



Si0 2 ... 







39-16 



A1 2 3 ... 







17-55 



Fe 2 3 ... 







9-97 



FeO ... 







5-66 



MgO ... 







15-16 



CaO ... 



• • • • • • 



. . . . • . 



nil 



Na o ... 





... 



279 



K 2 6 ... 







5-66 



H 2 ... 







2-50 



Ti0 2 ... 







0-64 



Cr 2 3 ... 







0-62 



MnO ... 







trace 



Fl 







0-78 



VA .- 





... 



trace 

 100-49 



Oxygen equivalent 





0-32 





Total 





100-17 



