Page:Transactions NZ Institute Volume 15.djvu/510

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, …Al S̈i³ + K̇ S̈i³, occurs as a constituent of the granites, syenites, gneiss, trachytes and Hyolites 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. 183, 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. 385, 471); by Dr. v. Haast in the granite and other crystalline rocks of the West Coast, and as sanidine in the trachytes and trachydolerites 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 trachytic 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 S̈i3 + Ṅa S̈i3, is mentioned by Dr. Hector in the diorites of the West Coast (Jurors' Rep. N.Z. Ex., 1865, pp. 266, 437); by Dr. v. Haast in dioritic 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, …Al S̈i2 + (Ċa, Ṅa) S̈i, is mentioned by Dr. Hector in trachydolerites from Flagstaff Hill (Jurors' Rep. N.Z. Ex., 1865, p. 437) 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 crystals 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).