408 Transactions. — Geology. 
brown and red, and occurs in considerable quantities at some places. It is 
mentioned by Dr. v. Haast (Jurors' Rep. N.Z. Ex., 1865, p. 257, and Geol. 
Rep., 1873-74, p. 9) associated with the quariz porphyries of Mount Somers 
and Snowy Peak, 
ALUMINATES or MAGNESIA AND GLUCINA. 
Spinel, Mg -Al.—The occurrence of rubies with garnet and topaz in the 
alluvium of Waipori, Otago, is mentioned by Dr. Hector (Jurors' Rep. N.Z. 
Ex., 1865, p. 416). This mineral is also mentioned from Manawatu, 
Wellington (Col. Mus. and Lab. Rep., v., p. 18) as rhombie dodecahedrons, 
and nearly opaque. They were not analyzed, and so are very probably 
garnets. 
SILICATES OF GuLUCINA, ZIRCONIA, THORIA, AND Yrrria. 
Zircon; Zr, Si.—The occurrence of this mineral is mentioned by Dr. 
Hector (Jurors’ Rep. N.Z. Ex., 1865, pp. 417, 438), who says ** erystals 
of zircon were exhibited, in the Museum of the Geological Survey, from 
Timbril's Gully," and (Trans. N.Z. Inst., vol. ii., p. 971) with platinum 
and gold in the wash of the south ; and by Dr. v. Haast from the western 
slopes of the Southern Alps (Geol. Rep., 1870-71, p. 24). In the collection 
of the Colonial Museum there is a specimen of a biotite rock from Doubtful 
Inlet, Otago, in which there are numerous minute tetragonal prisms with 
pyramidal ends of a bright red colour, transparent, which are probably 
zircons. 
Topaz, 5 A] Si + (A F? + Si F2).—Is mentioned by Dr. Hector at 
Chatto Creek, Arrow River, aud Waipori (Jurors’ Rep. N.Z. Ex., 1865, 
pp. 265, 438) ; and (p. 416) he says, “in collections from the Otago Gold- 
fields' department were some uncut topazes as large as pigeons' eggs, and 
of a pure white colour. Several smaller topazes of various eolours have 
lately eome into the possession of the Geological Survey of Otago from the 
neighbourhood of Waipori, where they are found in the alluvium along with 
rubies, garnets," ete. 
Emerald, A] Si? + 8 Gl Si.— Specimens of this mineral have been for- 
warded from Dusky Sound by Mr. W. Docherty, of which Mr. Skey 
says:—'' This is a somewhat rare mineral collecied by Mr. William 
Docherty, from a vein in the vicinity of Dusky Sound. When tested, 
it was found to be the mineral beryl, the distinguishing feature of which is 
the presence therein of the rare metal glucinum (beryllum.) Usually, this 
is to the extent of 12 to 15 per cent. in specimens of this kind. The 
mineral is of a full rich green colour, which it owes to the presence of 
sesquioxide of chrome. It occurs at Dusky Bay, in a pyrrhotiniferous 
quartz, forming little nests of confusedly crystalline masses having a 
tendency to assume a tabular form,” 
