140 BEPORT — 1891. 



■cular crystals, some with blunt or jagged terminations ; others, 

 especially larger ones, acutely pointed from one side. Most 

 are quite black-opaque throughout, but some larger ones are 

 faintly deep-brown-translucent. It is probable these inclusions 

 represent acmite. 



8. Pine Hill, near Pori^hyry Outcrop. 



Bock. — Light and dark greenish-grey, dense, and slightly 

 porphyritic. Gives a large amount of gelatinous silica on treat- 

 ment with HCl. 



Sections of light-coloured rock, colourless transparent 

 ground-mass of allotriomorphic nepheline, with microlites of 

 saiaidine in no great abundance. Light- and dark-green micro- 

 lites (tegiriue ?) in some parts scantily, in others abundantly, 

 distributed in tufts ; also closely aggregated in larger and 

 smaller roundish patches. Idiomorphic nephelines and sani- 

 dines numerous, the latter often in Carlsbad twins. Augite in 

 columnar crystals of green colour rather frequent. Horn- 

 blende occurs sparingly in large crystals of dark-brown colour. 

 Apatite scarce. Iron-ore grains scantily distributed. There 

 are also observable a few good-sized particles of water-clear 

 glass, showing irregular forms with sharp outlines. 



■-9. Boulder found with those of the Coarse Porphyry on the 

 Pine Hill Spur (must have come from an Outcrop) on 

 Pine Hill). 



Bock. — Dark greyish-green, dense, and rendered porphyritic 

 principally by crystals of sanidine, which are generally dis- 

 posed parallel to the clinopinacoid. 



Sections. — Ground-mass similar to that of No. 8, but the 

 green microlites are of darker shade, in the average larger, and 

 more abundantly and evenly distributed. Idiomorphic nephe- 

 lines of large and small size abundant, and occasionally aggre- 

 ^gated in groups. Sauidines large and numerous, frequently in 

 fine Cai'lsbad twins. Augites of green colour not plentiful, 

 and in the average rather small. Hornblende in large dark- 

 brown crystals very scarce. Apatite and iron-ore sparingly 

 distributed. Particles of water-clear glass — some of large size 

 — of irregular shapes with sharp outlines, rather abundant. 



10 Top of Flagstaff Hill (2,196ft. high), about Seven Miles 

 norih-ivest of Dunedin. 



Bock. — Very dark greenish-grey, dense base, rendered 

 strongly porphyritic by rather large crystals of sanidine, gene- 

 rally disposed parallel to the clinopinacoid. Gives much gela- 

 tinous silica on treatment with HCL 



