N. Z. ROCKS. 109 
2. Basatr Group. 
Compact nearly black rocks, dull conchoidal fracture 5 
contain Carbonates, Zeolites, Olivine, and Mag- 
netic Tron Ore. 
a. Common Compact Basalt. Pine Hill, Otago. 
6. Porphyritic Basalt. Tomahawk Bay, Otago. 
ce. Vesicular Basalt. Lyttelton Tunnel, Canterbury. 
d, Amygdaloidal Basalt. The Heads, Otago. 
A.b,.—Basie Plutonic Rocks. 
4, Diapase Group. 
Crystalline-granular compounds of Oligoclase, Labra- 
dorite, and Albite; with Pyroxene and some 
Chlorite ; in a fresh state, dark green. 
a. Granular Diabase. Brook Street Valley, Nelson. 
6. Fine grained Diabase. North end of Boulder 
Bank, Nelson. 
e. Porphyritic Diabase. Nelson. 
5. Gapsro Group. 
Compounds of Labradorite, or Saussurite with Dial- 
lage, Smaragdite or Hypesthene, and other mine- 
rals ; irregular in composition and texture. 
a. Gabbro, Hokuri Creek, Otago. 
d. Hypersthenite. Dun Mountain, Nelson. 
6. Diorite Group. 
Crystalline-granular compounds of Felspar (not Ortho- 
clase) and Hornblende; in a fresh state usually 
dark green. 
a, Granular Diorite. Wairoa Gorge, Nelson. 
6. Fine grained Diorite. Moanataiari Creek, Auck- 
land. 
e. Porphyritic Diorite. West Coast, Otago. 
J. Amygdaloidal Diorite. Pelovus Valley, Marl- 
borough. 
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