464 THE OEOLOGY OF THE NEW HEBRIDES, 



which proves to be a rather basic andesine (Ab;3 Aiio), the same 

 with that of the second generation; this addition has been made 

 during the second generation of crystallisation, and is in crys- 

 talline continuity with the labradorites of the kernel; the felspar 

 glomerules show, therefore, the phenomenon of rejuvenescence. 



Pyroxene is represented only in the groundmass, where it 

 appears in quantity as light greenish-yellow grains. Olivine in 

 large clear porphyritic crystals up to 2 mm. diam.; also in the 

 groundmass as microscopic idiomorphic grains. Magnetite 

 appears in scattered grains, usually very tiny. Apatite in tiny 

 laths, one of the first products of crystallisation. 



Order of consolidation — 



Fels. 



Mag. 



OHv. 



Mag. 



Oliv. 



Fels. 



A n a 1 }'■ s i s (see appended table). 



N a m e. — Glonieritic basalt porphyrite.^ 



Jevons's nomenclature. — Glomerophyri-pilotaxi-oli-feh^-gahhro- 



niicrite.X 



American classification : — 



Norm. 



Quartz 4-20 



Orthoclase 3-34 



Albite 12-05 



Anorthite 49-76 



Diopside , ... 6-31 



Hypersthene 13-19 



Magnetite 6-37 



Ilmenite 2-28 



Apatite , ... 0*90 



H.,0 1-44 



100-20 



* The term basalt i)orpliyrite seems to be particularly applicable to a rock 

 of this type — a basalt containing a generation of coarsely crystalline matter 

 more abundant than the expression porphyritic basalt signifies. 



t Although felspar is here an index mineral, yet its exceptional abundance 

 warrants special mention. 



X No definite knowledge of the dimensions of the mass were obtained; all 

 that can be said with certainty is that it is an intrusion. 



