460 THE GEOLOGY OF THE NEW HEBRIDES, 



light yellowish-green colour and has a narrow dark border in 

 which magnetite dust is readily discernible. It has an extinction 

 angle of 11° on the h pinacoid, and exhibits strong pleochroism. 



a = light yellow, 



b = greenish-yellow. 



t — yellowish-green. 

 a < b = c 



Pyroxene is very scanty, appearing as tiny faintly-tinted 

 irregular fragments whose physical properties agree closely with 

 diopside. Magnetite occurs as scattered grains of small dimensions. 

 Apatite is present in minute amount as tiny rods, rendered most 

 noticeable when embedded in the substance of the felspars. 



Order of consolidation — 

 Mag. 



Apat. 



Horn. 



Fels. 

 Analysis (see appended table). 

 Nam e. — Hornblende andesite. 



Jevons's nomenclature — Fanidiomorphi-hypohyali-monodioro- 

 phite. 



American classification : — 



Norm. 

 Quartz ... ... ... ... 17'76 



Oi'thoclase 



Albite 



Anoithite 



Diopside 



Magnetite 



Ilmenite 



Apatite 



CO., 



20-02 

 25-15 

 21-96 

 6-45 

 5-57 

 0-91 

 0-50 

 0-10 

 1-21 



99-76 



