— 
NG 
28 
mR Ws Sa Ss 
N. Z. ROCKS. 121 
ROCKS, COMPOSED OF ONE MINERAL ONLY. 
69. Oran Group. 
White Amorphous Silica. 
. Siliceous Sinter. ‘Taupo. 
Semi-opal. Pomahaka. 
Menilite. Malvern Hills, Canterbury. 
70. Quartz GRovupP. 
Rock Crystal and Amethyst. Thames, Auckland. 
Common Quartz. Rewaka, Nelson. 
Ferrugi ious Quartz. Thames, Auckland. 
Hornstone, or Chert. Ruatanua, Nelson. 
Lydian Stone. Wangarei, Auckland. 
Jasper. Hongikori, Auckland. 
Agate. Upper Harbour, Dunedin. 
. Flint. Marlborough. 
76. Barytes, or Heavy Spar. Auckland. 
78. Phosphorite. Taranaki. 
84. Malachite. Nelson. 
88. Kaolin, or Porcelain Clay. 
95. Bole. Lyttelton, Canterbury. 
104. Galena. Nelson. 
106. Arsenical Pyrites. Nelson. 
107. Marcasite. 
108. Pyrites. Collingwood. 
110. Sulphur, White Island. 
111. Dunite. Dun Mountain, Nelson. 
112. Jade. West Coast, Otago. 
