502 Transactions. 



tions completely cataclastic. Smashed grains of epidote and 

 quartz constitute the whole mass of the rock. 



Cutting north side Mackinnon Pass (G 17, G 10) : A pale- 

 green rock, with no distinct crystals showing. In thin slices, 

 much crushed. Quartz frequent ; oligoclase equal in quantity 

 to quartz. Twin lamellae curved and broken in many grains. 

 Fine 'granular epidote frequent, and a few grains of rutile 



Hornblende Schists. 



Blanket Bay, Doubtful Sound (G 14) : A dark greenish-grey 

 rock, showing on the broken surface abundant cleavage planes 

 of hornblende. In thin slices pale-green hornblende composes 

 more than half the rock. Shows some secondary corrosion, as 

 evidenced by the rounded inclusions of quartz. Around and 

 between the hornblendes fine granular quartz and oligoclase 

 angular grains completely interlocked. A few small plates of 

 brown mica and some crystals of clear rutile. A few crystals 

 of pale- pink garnet. 



Dea's Cove, Thompson Sound (G 26) : A finely foliated 

 rock, with conspicuous hornblende, with cleavage planes parallel 

 to the foliation planes. Section shows abundant pea-green 

 hornblende, not highly pleochroic. It constitutes five-sixths of 

 the rock. It contains some rounded quartz inclusions, but less 

 noticeably than the rock from Anita Bay and Bowen Falls. 

 The hornblende also contains inclusions of brown rutile. The 

 colourless minerals are quartz showing undulose extinction and 

 oligoclase with bent lamellae. In some specimens (G 25) there 

 are inclusions of rounded grains of colourless rutile in great 

 abundance. 



Anita Bay (G 20, G 23) : Hornblende schist. A dark rock 

 with conspicuous cleavage planes of hornblende. In thin slices 

 the hornblende crystals are pale-green, not strongly pleochroic, 

 sometimes with thin laths of brown mica round the margin. 

 The rest of the rock is fine-grained, consisting of a mixture of 

 hornblende and quartz, which often shows evidence of a flow 

 movement round the larger crystals, producing an eye structure. 

 There is a little magnetite in the fine-grained part. Other speci- 

 mens from near the same locality have no large crystals of 

 hornblende, but sphene is rather plentiful in them. 



The rocks from Anita Bay described in a previous paper * 

 were hartzbergite and dunite. The hartzbergite showed an 

 apparent change from silicate to carbonate in some of the 

 crystals, especially in those of enstatite. A further inspec- 



* Marshall, Trans. N.Z. Inst., 1904, p. 481. 



