BY H. I. JENSKN. 109 



equal to that of serpentine. In minute amount the following 

 occur (vi.) zoisite, (yii.) cyanite, (viii.) apatite. 



(3) Name and Affinities. — This rock has the composition of an 

 altered syenite. Greenstone is the most suitable field name. It 

 has affinities with epidiorite, trachydolerite and picrite. There 

 are varieties of this rock in which felspar greatly predominates 

 in amount, while serpentine and calcite occur in notable amount. 



Sp. No.70. Hornblende Schist. Loc: Mt. Mee. (Plate xi., fig. 2): 

 i. In handspecimen this rock looks like a schistose greenstone 

 containing large phenocrysts of hornblende, which are sometimes 

 tabular, usually finely striated, and six-sided in cross-section. It 

 covers a wide area on Mt. Mee, and occurs also in the Delaney's 

 Creek country. 



ii. (1) Holocrystalline and porphyritic. The phenocrysts are 

 large, many exceeding 5 mm. in diameter. The other constitu- 

 ents are fine-grained. These have an arrangement which is not 

 unlike trachytic texture in volcanic rocks. 



(2) Essential minerals (in order of decreasing abundance): — 

 Anthophyllite which forms all the phenocrysts referred to. It 

 is practically colourless and almost nonpleochroic. Occasionally 

 it is slightly bluish and pleochroic. It has the typical horn- 

 blendic cleavage and high double refraction. The extinction is 

 usually straight, but occasionally low angles are observed. The 

 phenocrysts are six-sided in cross-section, have the prism and. 

 pinacoid faces well developed, but are usually irregularly 

 terminated. Occasionally the anthophyllite is intergrown with 

 actinolite. Chlorite and serpentine are both well represented. 

 Felspar and colourless nonpleochroic epidote are present in 

 smaller amount. In notable quantities both actinolite and 

 uralite occur. The uralite occasionally contains grains of augite. 

 The actinolite occurs in the form of long needles. A little 

 tremolite is also present. In minute proportions there is present 

 sillimanite with characteristic cross cracks and medium double 

 refraction. A considerable amount of secondary hematite and 

 limonite is present. 



