434 Transactions. —Geology. 
But, in addition to this, the mineral from the Great Barrier contains a little 
antimony and traces of copper, silver, and iron. It occurs as a finely 
crystalline vein associated with Galena in larger crystals, the matrix being 
diorite, and was collected by Captain Hutton from Mine Bay, Great Barrier 
Island 
Mimetesite.—The specimen representing this mineral, which is included 
in the Melbourne Exhibition Catalogue as coming from the Dun Mountain, 
has proved on further examination to be Wulfenite, or molybdate of lead, 
and is accordingly described under Molybdenum. 
Bournonite, Pb Sb" + xy’? Sh’”.—A specimen of this mineral was col- 
lected from the Rolling River, Wangapeka, Nelson, in 1867. No further 
specimens have been obtained. It occurs in quartz with Galena,is of a 
steel-grey colour, and has a metallic lustre. 
It consists of sulphide of antimony and lead, with a little sulphide of 
copper and traces of iron and silver as sulphides. 
Tin. 
Cassiterite, Sn.—It is from one locality only in New Zealand that any } 
well authenticated discovery of tin ore has been made, and the specimens 
in question were obtained from tailings of certain auriferous cements ab 
Lankey’s Gully, Reefton, being forwarded for identification by Mr. A. D. 
Bayfield, of Nelson. 
The Cassiterite occurs as small grains, associated with iron pyrites and 
an iron-black hematite (Black Maori of the diggers), and although up to the 
present time the extent and value of tie deposit have not been determined, 
the discovery is at least of interest, and may lead to one of considerable 
importance. 
It should be mentioned that during the year 1876 specimens purporting 
to have come from Tuapeka, and containing tin, were forwarded to the 
Meena thong Me: Blair, but this discovery has not been further con- 
firmed. 
Copatt. 
Hitherto the presence of Cobalt in New Zealand has only been proved 
in very small quantities, and the localities at which it has been obtained 
are also comparatively few. 
Cobalt Bloom—Erythrine, Co® ae + 8H—This mineral is mentioned by 
Dr. Hector (Jurors’ Rep. N.Z. Ex., 1865, pp. 265, 487) as occurring in 
the pclae ares, of the Went Const nf Oleg. 
‘hich Cot lt frequently 
Asbolite.- which is an earth 
occurs, is mentioned by Mr. J. A. Pond (Trans. N.Z. Inst., vol. x. p- 456) 
__ 88 occurring in four distinct places in the Auckland district, district, but the locali- 
- ties are not cited. Re eee eee ent 
