114 



B. K. EMERSON — PLUMOSE DIABASE AND PALAGONITE 



Analysis 



IX. 



X. 



XI. 



XII. 





Kerato- 

 phyr, New 

 Haven. 



Holyokeite 



(VIII) 

 minus H 2 

 and calcite. 



Kerato- 

 phyr (IX) 

 minus H 2 

 and calcite. 



Albite, 

 Danbury, 

 Connect- 

 icut. 



SiOj 



60.13 

 20.47 

 1.04 

 .72 

 1.15 

 2.59 

 9.60 



65.37 

 19.87 



64.77 



22.05 



1.12 



65.73 



AP0 3 



21.32 



Fe 2 3 



0.12 



F 2 



1.08 

 .16 

 .49 



9.58 





MgO 



.16 



.43 



10.34 





CaO 



1.95 



Na 2 



Li 2 



9.66 



K 2 



1.06 



1.92 



1.72 



0.95 



H 2 0— below 100 



0.19 



H 2 0— above 100 











Ti0 2 



Trace. 



3.44 : 



(*) 



1.04 

 .02 



Trace. 





Zr0 2 





C0 2 







S0 3 









P„(X 



.13 



.21 







s 5 









NiO 









MnO 



Trace. 



A little lost. 

 None. 

 None. 

 .17 



Trace. 





BaO 





SrO 









CuCu 



















99.89 







99.92 











* Ignition: Includes H 2 0. 



Analysis IX. Acid dike in the Trias at New Haven. By H. S. Washington. A 

 relatively acid dike in the Connecticut Triassic area. By E. O. Hovey. Amer- 

 ican Journal of Science, 4th series, vol. iii, 1897, p. 287. The rock is called 

 Keratophyr. 



Analysis X. The Holyokeite analysis (VII) with the water and calcite equivalent 

 to the C0 2 subtracted and the remainder calculated to 100 per cent. This is 

 justifiable, since all the amygdules in the rock are of calcite. 



Analysis XI. The New Haven dike, analysis IX, recalculated in a way similar to 

 that employed in analysis X. As there was not enough CaO to satisfy the 

 C0 2 , it is assumed that about the same proportion of the "ignition" is C0 2 

 as in the holyokeite analysis, and this is calculated to a mixture of ankerite 

 and calcite, such as is common in the secondary carbonates in the trap. This 

 is justifiable, since the rock analyzed effervesced freely with acid and since 

 iron is "conspicuous by its absence" in the slides examined by Mr Hovey. 

 This procedure perhaps overemphasizes the resemblance between the two 

 analyses, since the New Haven rock is somewhat decomposed and contains 

 some chlorite. 



Analysis XII. Albite from Danbury, Connecticut. By F. L. Sperry. American 

 Journal of Science, vol. xxxiv, 1877, p. 392. For comparison with the holy- 

 okeite and the keratophyr of Hovey, analyses X and XI. 



