112 



B. K. EMERSON — PLUMOSE DIABASE AND PALAGONITE 



CHEMICAL ANALYSES 



Analysis 



I. 



la. 



II. 



III. 



IV. 





Palagonite, 

 Holyoke. 



I made 

 anhydrous. 



Palagonite, 

 Palagonia. 



Palagonite, 

 Seljadalr. 



Glass and 

 quartz bear- 

 ing diabase, 



Holyoke. 



Si0 2 



40.35 

 5.11* 



24.99 



3.55 



5.48 



1.32 



.18 



48.70 

 6.17 



30.16 

 4.28 

 6.61 

 1.59 

 0.22 



41.26 



8.60 



25.32 



38.96 

 11.62 

 14.75 



53.52 



AP0 3 



9.70 



Fe 2 3 



F 2 



8.06 

 9.45 



MgO 



4.84 

 5.59 

 1.06 



6.29 

 913 



.68 



2.52 



CaO 



5.64 



Na 2 



2.24 



Li 2 0, 





K 2 



1.44 



8.51 



8.51 



.20 



1.76 



0.54 



0.72 



1.50 



H 2 0— below 100. 

 H 2 0— above 100. 

 Ti0 2 



1.67 



".2*4" 



12.79 



17.85 



2.16 

 1.98 



Zr0 2 . . 







.03 



co 2 



None. 









1.02 



SO, 









None. 



P 9 (X 









.36 



s 



<( 









.10 



F 











NiO 



.22 



None. 



(i 









None. 



MnO 



.27 







.26 



BaO 







None. 



SrO 









None. 















99.86 



99.08 



100.00 



100.00 



100.21 



* With possible P 2 5 . 



Analysis I. Palagonite in gabbroid quartz diabase, New Reservoir, Holyoke 

 Massachusetts. Specific gravity, 1.91. By Mr George Steiger. 



Analysis la. I made anhydrous. 



Analysis II. Palagonite. Palagonia, Sicily. S. yon Waltershausen, Ueber die 

 Vulcanischen Gesteine. Analysis calculated to 100 after subtracting 10.99 

 insoluble residue. 



Analysis III. Palagonite, Seljadalr, Iceland. By Bunsen. Cited by von Walter- 

 shausen, loc. cit. Insoluble residue (4.11) subtracted and the remainder cal- 

 culated to 100. 



Analysis IV. Coarse gabbroid quartz-diabase, containing much palagonite and 

 original quartz and calcite, from an average sample of the very fresh coarse 

 porphyritic rock from the great block that furnished the best palagonite. By 

 George Steiger. 



