CHEMICAL ANALYSES 



113 



Analysis 



V. 



VI. 



VII. 



VIII. 









Normal dia- 

 base, mount 

 Holyoke. 



Tachylite, 

 Meriden. 



Analysis IV 



minus 



glass and 



carbonates. 



Holyokeite, 

 mount Tom. 



Si0 2 



52.68 

 14.14 

 1.95 

 9.75 

 6.38 

 9.38 

 2.56 



46.86 

 13.96 

 5.23 

 4.67 

 7.69 

 9.42 

 1.85 

 Trace. 

 2.02 

 1.29 

 3.43 

 1.13 



60.08 

 11.12 

 3.76 

 10.47 

 1.84 

 6.21 

 2.43 



"i.60 



53.83 



A1 2 3 



16.36 



Fe 2 3 



0.89 



F 2 





MgO : 



.13 



CaO 



9.81 



Na 2 



7.89 



Li 2 





K 2 



.88 

 Ig. 1.60 



1.58 



H 2 0— below 100 



.15 



H 2 0— above 100 



Ti0 2 



' 2.64 ' 

 .04 



.36 

 .86 



Zr0 2 





.02 



C0 2 





2.19 



7.47 



SO, 







P.O. 





.15 



.48 

 .13 



.11 



s .. 5 :... :. 





.17 



F 





Trace. 

 Trace. 





NiO 





None. 



.28 

 None. 

 None. 





MnO 



.44 



Little lost. 



BaO 



.03 

 Trace. 



None. 







None. 



CuCu 





.14 















99.80 



99.92 





99.77 









Analysis V. Compact diabase, mount Holyoke. Mean of two analyses. By G. W- 

 Hawes. American Journal of Science, 3d series, vol. ix, 1875, p. 186. 



Analysis VI. Diabase pitchstone from the base of the trap sheet at the " ash bed " 

 at Meriden, caused by the rising of muddy water up into the molten trap from 

 below. By H. N. Stokes. Diabase pitchstone and mud enclosures of the 

 Triassic trap of New England. Bull. Geol. Soc, vol. 8, 1897, p. 77. 



Analysis VII. Analysis IV of the glass, quartz, and calcite bearing diabase, with 

 an amount of glass removed equivalent to the amount of water according to 

 analysis I and of calcite and siderite equivalent to the C0 2 . The entire fresh- 

 ness of the material and the visible amounts of glass and carbonates justify this. 



Analysis VIII. Holyokeite, east foot mount Tom, Hillebrand. Holyokeite, a 

 purely feldspathic diabase from the Trias of Massachusetts. Journal of Geol- 

 ogy, vol. x, 1902, p. 508. 



