DALY. — COMPOSITIONS OF IGNEOUS-KOCK TYPES. 

 GROUP XIII. 



231 



No. of 



Analyses. 



Si0 2 



Ti0 2 



A1 2 3 



Fe 2 3 



FeO 



MnO 



MgO 



CaO 



Na 2 



K 2 



H 2 



P,0, 



Effusives. 



81 



V C M 



o ik -a 

 *2~ 



10 



74.04 



.18 



13.19 



1.35 



1.01 



.04 



.32 



1.19 



3.88 



3.75 



1.02 : 



.03 



82 



11 



48.36 



.66 



15.40 



6.48 



10.07 



.80 



4.19 



8.69 



3.34 



1.30 



.43 



.28 



83 





52.04 



.76 



17.65 



4.66 



2.75 



.13 



3.33 



5.11 



4.10 



5.03 



3.74 



.70 



84 



JO 



53.56 



.82 



17.88 



4.51 



3.05 



.07 



3.62 



6.45 



3.41 



3.76 



2.32 



.55 



85 



.So 



50.11 



.96 



13.04 



4.58 



3.94 



.11 



9.27 



7.63 



1.94 



4.15 



3.58 



.69 



86 



^- to 



47.45 



.81 



11.43 



3.22 



5.78 



.12 



14.60 



8.18 



2.32 



2.99 



2.50 



.60 



87 



2 c3 



36.19 

 7.11 



10.52 

 8.48 

 5.97 



14.59 

 9.88 

 3.28 

 2.03 

 1.94 

 .01 



Calculated as Water-free. 



Si0 2 



Ti0 2 



A1 2 3 



Fe 2 3 



FeO 



MnO 



MgO 



CaO 



Na 2 



K 2 



P,O s 



74.80 



.18 



13.33 



1.37 



1.02 



.04 



.32 



1.20 



3.92 



3.79 



.03 



4S 



15 



6 



10 



54.06 



.79 



18.34 



4.S4 



2.85 



.14 



3.46 



5.31 



4.26 



5.22 



.73 



54.84 



.84 



18.31 



4.62 



3.12 



.07 



3.70 



6.60. 



3.49 



3.85 



.56 



36.90 

 7.25 



10.73 

 8.65 

 6.09 



14.88 



10.08 



3.34 



2.07 



.01 



Each sum = 100.00 



1 Includes 2.85 % Cr 2 3 . 

 3 Loss on ignition. 



2 Includes .02 % Li 2 and .23 

 4 Includes 2.47 % Cr 2 3 . 



%S0 3 



