Trans. N.Z. Inst., Vol. XXXIV. 



Pc.XXV 



D. 



Fragment in Grit at Cheltenham Beach, 



Magnified 50 Diameters. 



Augite crj'stals 

 Feldspar crystals 

 Magnetite specks 

 Chlorite 



Some of the larger green crystals may be altered olivine , 

 the rest is probably due to the alteration of some pyroxene. 



ROCK SECTIONS.— Mulgan. 



