and not n 



hexapronal prisms occasionally terniinated by pyramids, lengtk 

 •005 to -01, breadth -001 to -002. They are distinctly dichroic, 

 changing from pale brown to purplish-brown. E > O. A high 

 magnifying power shews that they are really colourless but with 

 inclusions in longitudinal bands, which make them appear to be 

 longitudinally striated. Quarry behind Summer on the Lyttelton 

 Road. Interesting from the apatite crystals which are like those 

 in the Hornblende Andesite from Dunedin, but are smaller. 



3. A dark grey, sub-vitreous, compact rock, divided into layers 

 by parallel, curved narrow pale bands, along which the rock splits. 

 S.G. 2-51. Section : Ground-mass abundant, crystallitic, banded 

 lighter and darker, the darker parts thick with magnetite dust, 

 and crowded with minute felspar microlites which shew fluxion in 

 the direction of the banding. The porphyritic minerals are 

 plagioclase, augite, and magnetite, there is also a yellow-brown 

 decomposition product present. The plagioclase goes up to -04 in 



in length Magnetite is in crystals. Part of a lava stream near 

 Heathcote. 



Coal Creek, Bnngitata.~A black sub-vitreous rock with yellowish 



globulitic, with scattered minute felspar microlites. The porphy- 

 ritic minerals are plagioclase and augite. The plagioclase is not 

 well twinned, occasionally pseudo-schillerised, goes to "08 in length. 

 The augite is brownish-green, sometimes decomposed into an 

 isotropic yellowish-green chlorite ; it is not abundant and goes to 

 •02 in length. Haast, Geology of Canterbury, p. 279 (Melaphyre). 



Fern Gully, Clent Hills, AsJtburton Co.— A brownish-black rock 

 ^vith yellowish felspars. S.G. 2-685. Section: Ground-mass 

 moderate, crystallitic, globulitic, with felspar laths (-02) and augite 

 grains, which are gregaritic. The porphyritic minerals are plagio- 

 clase, augite, and magnetite. The plagioclase crystals are not 

 abundant, but go up to -09 in length. The augite is pale greenish, 

 small, partly altered into a brownish-green chlorite. Haasr. 

 Reports Geol. Expl., 1872-4, p. 7, and Geol. Cant. p. 2Sl', 

 (Melaphvre). 



Ifb/h^'l^.^ks, .Unlvprn IIUh.—A very dark grey rock with 



augite. The plagioclase is in laths up to -15 in le 

 augite is in small broken purplish crystals. 



C't-itle II ill, Selwyn Co.— Brownish-black compact 

 ■^hite or yellowish felspars more or less conspicuous. 



