110 N. Z. ROCKS. 
7. APHANITE Group. 
Compact, apparently homogenous mass, dark green to 
black ; tough, sometimes porphyritic; vesicular 
or amygdaloidal. 
a. Common Compact Aphanite. Greenstone River, 
Otago. 
8. MELAPHYRE Group. 
Dark green, brown, or black rocks, compounds of 
Felsite, Pyroxene, Hornblende and Magnetic 
Tron Ore; compact, porphyritic, vesicular, or 
amygdaloidal, always free from Quartz. 
a. Melaphyre. Hewson’s Creek, Orari, Canterbury, 
9. PorPHYRITE GROUP. 
Contain in a felsitic matrix (usually dark color) indi- 
vidual crystals of Felspar, Mica, or Hornblende ; 
the matrix may be vesicular or amygdaloidal, but 
contains no Quartz. 
A. Felspar Porphyrite. Nelson. 
Aa. Crystalline Felspar Porphyry. Nelson. 
Ae, Vesicular Felspar Porphyry. Tongariro. (?) 
B. WHornblende Porphyrite. Sugar Loaf, Taranaki. 
La, Crystalline Hornblende Porphyry. Sugar Loaf, 
Taranaki. 
C.  Mica-porphyrite. 
Ca. Crystalline Mica Porphyry. West Coast, Otago. 
10, Mica Trae Group. 
Compounds of Mica and Felspar, without porphyritic 
texture. No Quartz. 
11. SyEenITE Group. 
Crystalline granular compounds of Orthoclase or Mi- 
croline and Hornblende, usually some Titanite. 
a, Common Granular Syenite. Wakatipu Lake, Otago. 
b. Porphyritic Syenite. The Bluff, Southland. 
