406 Transactions. — Geology. 
It was obtained from Dead-horse Gully, Lake Wakatipu, by Mr. McKay, 
who states that it occurs on the strike of the Moke Creek copper lode. A 
similar mineral has been forwarded by Mr. W. Docherty from Dusky Sound 
where it occurs in gneiss, 
Orthoclase, A Si? + K SiS, occurs as a constituent of the granites, 
syenites, gneiss, trachytes and rhyolites of New Zealand. It is mentioned 
by Dr. Hector as occurring in all the schists and crystalline rocks of the 
West Coast (Jurors’ Rep. N.Z. Ex., 1865, pp. 266, 437), in granite from 
the Auckland Islands, and in granite and hornblende rocks from Ruapuke 
(Trans. N.Z. Inst., vol. ii., pp. 188, 185), in dyke granite at Great Barrier 
Island (Trans. N.Z. Inst., vol. ii, p. 375), and as sanidine in the trachyte 
of the Sugar Loaves, Taranaki (Geol. Rep., 1866-67, p. 8); by Dr. v. 
Hochstetter as sanidine in the rhyolitic tufas of Lake Taupo, and flesh- 
coloured felspar in the syenite of the Boulder Bank, Nelson (New Zealand, 
Eng. ed., pp. 885, 471) ; by Dr. v. Haast in the granite and other crystal- 
line rocks of the West Coast, and as sanidine in the trachytes and trachy- 
dolerites of Banks Peninsula (Jurors’ Rep. N.Z. Ex., 1865, p. 257, and 
Trans. N.Z. Inst., vol. xi., p. 504) ; and by R. Daintree, Esq., F.G.S., in 
dolerite of the Hororata district and Acheron section ; in trachytie rocks at 
Mt. Misery and Snowy Peak Range and also in a granitic rock and 
pitchstone at Snowy Peak Range (Trans. N.Z. Inst., vol. vii., p.458). The 
specimens in the collection of the Colonial Museum are a pink variety in 
granite from Dusky Sound, and a yellowish white specimen in a granitic 
dyke from Great Barrier Island. 
Albite, Al Sis -- Na Si’, is mentioned by Dr. Hector in the diorites of 
the West Coast (Jurors’ Rep. N.Z. Ex., 1865, pp. 266, 487); by Dr. v. 
Haast in dioritie porphyries of the River Wilkes and Makarora Ranges 
(Jurors' Rep. N.Z. Ex., 1865, p. 257); by Mr. E. H. Davis at the Dun 
Mountain (Geol. Rep., 1870-71, p. 112); and by Prof. Liversidge from 
George Sound (Trans. N.Z. Inst., vol. X., p. 498). There is a white 
massive form, with chlorite, from Maori Point, Shotover, in the collection 
of the Colonial Museum. 
Labradorite, A Si? + (Ca, Na) Si, is mentioned by Dr. Hector in 
trachydolerites from Flagstaff Hill (Jurors Rep. N.Z. Ex., 1865, p. 487) ; 
and by Dr. v. Haast in lava streams at Banks Peninsula (Jurors' Rep. 
N.Z. Ex., 1865, p. 257), and in the basalts and as large erystals in the 
dolerites of Banks Peninsula (Trans. N.Z. Inst., vol. xi., p. 499). There 
is a specimen in the collection of the Colonial Museum from Purahanui, 
Otago, of a dirty brown colour, showing play of colours on cleavage planes, 
and another, of a grey colour, in dolerite from Mt. Charles, Otago. 
Saussurite is mentioned by Dr. v. Haast in gabbro from Mt. Torlesse 
Jurors' Rep. N.Z. Ex., 1865, p. 257). : 
