330 Washington — Charnockite Series of Igneous Bocks. 



The norm of A is as follows : 



Or 



Ab 



An 



Di... 



Hy-- 



01. 



Mt 



II 



A P 



This places the rock in camptonose, with the symbol 

 III. 5. 3. 4". It will be seen that, allowing some of the albite 

 molecule for alkali feldspar, and some anorthite to enter horn- 

 blende, the normative feldspar is essentially of the composition 

 AbjAn^ confirming the view that by far the greater part of 

 the unstriated feldspar is labradorite. 



5 



00 



26 



■20 



15 



■29 



19 



4 3 



20 



27 



5 



63 



3 



•71 



3 



65 







34 



SiO, 



Al 



Ana 

 A 



50-04 



11-65 



Table III. 



lyses of Nor 



B 



53-38 



19-38 



15-39 



n.d. 



2-79 



7-68 



n.d. 



n.d. 



'tes. 



C 



52-21 



19-24 



10-46 



n.d. 



2-36 



7-28 



3-48 



1-09 



3-12 

 1-21 



D 

 51-49 

 20-72 

 7-28 

 1-80 

 3-82 

 6-71 

 3-70 

 2-14 

 0-41 

 2-26 

 0-15 



E 

 54-33 



11-43 



FeO 



FeO 



15-76 

 . 2-63 



7-47 

 6-10 



MgO 



CaO 



NaO 



5-58 



7-89 

 3-08 



11-70 

 4-25 

 3-52 



KO 



0-89 



0-59 



2 



HO.. 



0-19 



0-60 



TiO, 



PO 



1-93 



0-20 



0-13 



0-06 









99-64 98-62 100-45 100-72* 100-18 



A. Hornblende norite. (III.5.3.4".) St. Thomas' Mount, Madras 

 (9-660). H. S. Washington analyst. 



B. Hornblende norite. Same locality (9*660). T. L. Walker 

 analj'st. T. H. Holland, op. cit., p. 156. 



C. Quartz norite. Rekefjord, Soggendal, Norway. C. F. Kol- 

 derup analyst. Berg. Mus. Aarb., 1896, No. v, p. 79. 



D. Norite (II. 5. 3". 4). Near Peekskill, N. Y. G. S. Rogers 

 analyst. Ann. N. Y. Ac. Sci., xxi, p. 61, 1911. 



E. Norite (111.5.3.(4)5). Zoanle, Ivory Coast. Pisani analyst. 

 A. Lacroix, C. R,, cl., p. 21, 1910. 



Bahiaite {Hornblende hypersthenite). 



A perfectly fresh specimen (9*672) of this type of the " ultra- 

 basic " members of the series, from Pammal Hill, Pallavaram. 



* Includes all *11 S and *13 MnO. 



