34 



Penfield and Stanley — 



V. Actinolite from the Mines of Kragero, Norway. — The 

 material for analysis was taken from a large, striated, pris- 

 matic crystal, without terminal faces, which was presented to 

 the Brush Collection by Prof. W. C. Brogger of Christiania. 

 The color of the large crystal was dark olive-green, but frag- 

 ments were light colored. The material floated at 3*180, sank 

 at 3*091, the average being 3*137. The results of the analysis 

 follow : — 

















Per cents of 





I 



II 



Average 



Ratios 





protoxide bases 



Si0 2 



57*07 



51*64 



51*85 



•864 ) 



•880 





TiO"„ 



1*26 







1*26 



•016 \ 





AL0 3 

 Fe'A 



4*36 



2*58 



4*37 



4*36 



2*58 



043 j 

 016 j" 



059 





FeO 



5*46 







5-46 



•075^ 





8-6 ) 



MnO 



•33 



•37 



•35 



005 | 





0-5 V64-8 



MrO 



19*35 



19-61 



19-48 



487 | 





55-7 ) 



CaO 



10*40 



10-81 



10-60 



•189 | 





21-6 ) 



K,0 



•35 







•35 



004 y 





0-5 f-26'1 



Na„0 



2*15 







2-]5 



035 







4*0 ) 



H 2 



1*35 



1-33 



1-21 



067 







7*7 



K 



•46 

 110° 





•46 



•13 



01 2 j 







1-4 



Loss at 





100-0 





100-24 









0=F 2 



•22 







1 





100-02 



YI. Actinolite from Pierrepont, /St Lawrence Co., New 

 York. — The specimen from which material for analysis was 



taken was collected by one of the writers while engaged in min- 

 eralogical work for the U. S. Geological Survey, and thanks are 



