372 



C. A. SUSSMILCH AND W. G. STONE, 



SiO, 



A1 2 3 



.. 15-05 



Fe 2 3 



2-60 



FeO ... 



.. 3-69 



MgO... 



2-82 



CaO ... 



4-30 



Na 2 



3-22 



K 3 ... 



3-00 



H 2 O(100°C. 



) 0-17 



H 2 O(100°C. 



+ ) 2-08 



C0 2 ... 



.. 0-80 



Ti0 2 ... '. 



.. 0-65 



Zr0 2 ... 



.. absent 



P 2 0,... 



.. 0-26 



so 3 ... 



.. 0-02 



* Trace less than O'Ol^ 





Per cent. 



Quartz 



.. 16-68 



Orthoclase 



.. 17-79 



Albite 



.. 27-25 



Anorthite 



.. 17-51 



Diopside 



2-04 



Hypersthene. 



9-80 



Class II. Dosalane. 



Order 4. Austrare. 



Chemical 



Coyxvpo&ition. 





Per cent. 





Per cent. 



60-95 



CI 



trace* 



15-05 



S (FeS 2 ) 



. absent 



2-60 



Cr 2 O s 



. absent 



3-69 



NiO and CoO 



trace* 



2-82 



MnO 



. 0-08 



4-30 



BaO 



. 0-13 



3-22 



SrO .. 



. presentf 



3-00 



Li a O 



. absent 



0-17 



V 2 3 



. 002 



2-08 



CuO ... 



trace* 



99-83 



Specific Gravity 2*796 

 f Spectroscopic reaction only. 



N 





Per cent. 



M agnetite 



3-71 



Umenite 



1-22 



Apatite 



0-67 



II 2 0, C0 2 . etc. 



3-09 





99-76 



Rang 3. Tonalase. 



Sub-rang 3. Harzose. 



Magmatic name Harzose. 



The diopside and hypersthene molecules together with 

 some of those allotted to anorthite will constitute the 

 pyroxene and its particular alteration product present in 

 the rock. The plagioclase felspar is one which contains 

 an excess of soda over lime and would approach andesine in 

 character. This soda-lime felspar is in excess of the ortho- 

 clase, although the proportion of the latter is fairly high. 



