112 N. Z. ROCKS, 
B. b.—Acidie Igneous Rocks, Plutonic. 
16. Granite Group. 
Crystalline granular compounds of Felspar, Quartz, 
and Mica ; in some varieties Chlorite, Tale, Horn- 
blende, and Schorl occur. 
a. Common Granite. Separation Point. 
6. Porphyritic Granite. Rakau River, West Coast. 
c. Gneissic Granite. Kanieri River, Hokitika. 
gy. Protogine Granite. Pickersgill Harbour, Otago. 
i. Schorlaceous Granite. Buller River. 
k. Adularia Granite. George Sound. 
17. Granite PorrHyry Grove. 
Granite with compact or fine grained base. 
g 
Granite Porphyry. West Coast, Otago. 
ce. Micaceous Granite Porphyry. 
18. Quartz PorrHyry, or Exnvanite Grove. 
A compact felsitic matrix, enclosing crystals of Felspar 
and Quartz. 
a Common Quartz Porphyry. Mine Bay, Great 
Barrier Island. 
19. Fretstonr, or FEtsrre rock Group. 
Texture compact, fracture dull, smooth, conchoidal or 
fissile ; color yellowish, reddish, grey, greenish or 
bluish, weathers white. Hardness, 6. 
a, Felstone proper. Wakapawaka, Nelson. 
20 Pircustone Group. 
Principal mass is homogenous, vitreous pitch-like 
appearance, fracture conchoidal, lustre resinous, 
translucent at the edges, color various. 
a. Common Pitchstone. Canterbury. 
b. Pitchstone Porphyry. 
