::it 



ilmenite in long plates ; in some cases with a little glass. The 

 felspar sometimes exceeds the augite, sometimes the augite exceeds 

 the felspar. Porphyritic minerals are chiefly augite and olivine ; 



gioclase is occasionally present in laths '035 in length. The 

 s usually glomero-porphyritic, the granules from -01 to -02, 



i the clusters about -08 in diameter ; it is pale greenish in colour. 

 Uhvine is abundant, colourless, up to -04 in length, some of it 

 altered to a brownish-green serpentine. Forms dykes in green- 

 sands, &c. Hutton, Trans. N.Z. Inst., Vol. xix., p. 403. 



Bank's Peninsula.~l . A grey compact rock, with scattered 

 small olivines. S.G. 2-93. Section : Ground-mass very abundant, 

 microlitic, granulitic, composed of felspar microlites (-005) and 

 augite in grains and prisms with little or no glass. Porphyritic 

 minerals are olivines only ; they are yellowish, usually about -02 

 in length or smaller, but sometimes up to -04. Port Hills. The 

 usual road metal of Christchurch. 



2. Dark grey to black, compact rocks, with scattered olivines, 

 sometimes altered into iron oxides, augite, and felspar. S.G. 2-92 

 to 2-96. Section : Ground-mass abundant, crystallitic with a 

 little clear l)ase, crowded witli microlites of felspar and augite, as 

 well as ni'aius of magnetite. Porphyritic minerals are plagioclase, 

 augite, olivine, and in some cases magnetite. The plagioclase is 



is idiomorpliie or allotriomorpliic, either moderate or abundant, 

 colourless, sometimes not above -03, sometimes up to •06 or '08 in 

 length, sometimes altered to a briglit, red-brown translucent, 

 anisotropic nuneral, probably htematite. Many places in the Port 

 Hills. The conspicuous dyke at the Hotel at Sumner is a vesicular 

 basalt, and contains idiomorphic olivine. Haast, Trans. N.Z. 

 Inst., Vol. XI., p. 449, and Geol. of Canterbury, p. 338, and 

 Section 6, f. 7. 



Moimt Eden, Auckland. — A dark grey vesicular rock with 

 thickly scattered small olivines. S.G. 3 01. Section: Ground- 

 mass a])undant, microlitic, granulitic, composed of augite grains, 

 felspar microlites, and magnetite in rather large grains. Porphy- 

 ritic minerals are augite and olivine. The augite is greenish-brown 

 about -01 in leiigth and generally glomero-porphyritic. The 



i" h'Mirih, cololIrle.^s. From neir'tlu' ].ul. Hoch>tetter, New 

 ^^alan<l, p. i';U. 



Rm,riu„tn Inland. A>nU,r»d—X h^ht grey \eMcuUr rock ^vith 



