332 Washington — Oharnockite Series of Igneous Rocks. 



The mode is as follows, about 5 per cent of augite being 

 estimated to be present : 



Hypersthene 46*0 



Augite 5-0 



Hornblende _. 40*7 



Ores _ 8-3 



Table IV. 

 Analyses of Pyroxenites. 

 ABC 



Si0 2 47-44 48-86 49 



A1 2 3 5-36 9-80 6 



Fe 2 3 3-13 16-35 1 



FeO 12-42 n.d. 10 



MgO 19-96 18-08 17 



CaO 7-60 9-57 11 



Na 2 0-48 trace 



K 2 Q 0-10 trace 



H„0 0-08 0-67 



Ti0 2 1-29 



Zr0 2 ,. none . 



P 2 6 0-27 none 



S 0-34 none 



Cr 2 9 __ 0-07 0-10 



MnO 0-15 



NiO... .... 



BaO . none 



CuO___. .... 



95 

 52 

 50 



41 

 02 

 77 

 98 

 52 

 81 

 15 



D 



51-23 

 6-17 

 1-96 

 6-95 



26-52 

 4-03 

 0-29 

 0-12 

 0'24 

 0-27 



none 

 0-41 

 0-31 

 1-46 



none 

 0-21 



E 



51-83 

 7-98 

 1-48 

 8-28 



24-10 

 5-26 

 0-35 

 0-06 

 0-29 

 0-29 



0-09 



0-31 



trace 



0-11 



T. L. Walker 



G. 



100-69 101-33 100-09 100'17 100-43 



A. Bahiaite (hornblende hypersthenite) (IV.lV'2.1.2). Pam- 

 mal Hill, Pallavaram, Madras, (9-672). H. S. Washington 

 analyst. 



B. Pyroxenite. Pallavaram, Madras. (9-394.) 

 analyst. T. H. Holland, op. cit., p. 166. 



C. Pyroxenite, Montrose Point, New York. (FvU.2.2.2.) 

 S. Rogers analyst. Ann. N. Y. Ac. Sci., xxi, p. 62, 1911. 



D. Bahiaite (hornblende hypersthenite). (CIV.) 1 (2.1.(1)2). 

 Maracas, Bahia, Brazil. H. S. Washington analyst. This Jour- 

 nal, xxxviii, p. 85, 1914. 



E. "Pyroxenite." Near Meadow Creek, Montana. (IV. 1.- 

 1(2).1.2). L. G. Eakins analyst. G. P. Merrill, Proc. IT. S. Nat. 

 Mus., xvii, p. 658, 1895. 



The specimens represented by A and B do not bear the same 

 number, but they come from near each other and must be 

 closely alike. Here we see the same discrepancies as in the 

 previous cases. The norm of A is as follows : 



