Blasdale.1 Contribution to Mineralogy. 333 



TABLE No. I. 

 Analyses of Green Hornblendes . 





1 



2 



3 



4 



5 



6 



Si 0. 2 



Al, O, 



55-21 

 3-45 



55-56 

 2.05 



55-5° 



55-oo 

 i-5i 

 ■99 

 3-46 

 23-31 

 10.38 

 1. 10 

 1 . 12 



55-oi 

 1.69 

 -56 

 3-46 

 23 .85 

 13.60 



•51 

 ■38 



56.33 

 1.67 



Fe 2 ;1 





Fe O 



Mg O 



Ca O 



Na, O 



7-49 

 18-97 

 10.50 



2-45 



5 97 

 19-45 

 12.13 



1.94 

 ■30 



6.25 

 22.56 

 13.46 



4-30 

 24.00 

 10.67 



K, O 







H., O at ioo° 









H 2 O above ioo°... 

 Mn O 



i-75 



2.58 



1.29 



2.90 

 •31 



1.02 



.48 



1.03 















99.82 



99.98 



99.06 



100.08 



100.56 



98.00 



1. Actinolite from Berkeley, California. 



2. Actinolite from San Pablo, California. 



3. Actinolite from Zillerthal, Rammelsberg, Mineral Chemie, S. 471. 



4. Actinolite from Scotland, Heddle, Trans. Roy. Soc. Edinburgh, vol. 28, 



p. 508. 



5. "Hornblende" from Russia, Michaelson, Journ. fur Prakt. Chemie, Band 



9t, S. 221. 



6. Actinolite from Concord, Mass., Seybert, Am. Journ. Science, vol. 6, p. 333. 



TABLE No. II. 



Caleulations Leading to the Formula of the Green Hornblende . 



Analysis 1, 



Elementary 



Atomic 



Atomic 



Analysis 



Elementary 



Atomic 



Atomic 



Composition. 



tjuoticiit, 



Ratio. 



Composition. 



tjunlii-nt. 



Ratio. 



Si O, 



55-2i 



Si 



25.96 



.921 1 



25.00 



SiO, 55.56 



Si 



26. 12 



.9270 



25.00 



A1. 2 O s 



3-45 



Al 



1.83 



.06S0 



1.84 



Al 2 3 2.05 



Al 



1 .09 



.0404 



1.09 



Fe O 



7-49 



Fe 



5-83 



.1048 



2.84 



FeO 5.97 



Fe 



4.64 



•0835 



2 25 



Co O 



io.5o;Ca 



7-5o 



.1886 



5-12 



Co O 12. 13 



Ca 



8.67 



.2180 



5-88 



Mg O 



18.97 



Mg 



H-43 



•4744 



12.87 



Mg O 19.45 



Mg 



1 1.72 



.4863 



13.11 



Na, O 



2-45 



Na 



1. 82 



■0795 



2.16 



Na, O 1.94 Na 



1.44 



.0629 



1.70 



K 2 O,, 











K 2 O . jo 

 H 2 G 2.5S 



K 



■ 2 5 

 .29 



.0064 

 .29 



.02 

 7. So 



H 2 C. 



■-I-75 



H 



.20 



.20 



5-43 



H 







O 



45.26 



2.85 



77.36 





O 



45-76 



2.88 



77.66 









mineral thus far reported, though it does not greatly exceed the 

 total sesquioxide content reported in analysis No. 4. The presence 

 of alkalies, in amounts sufficient to be considered as important 



