434 Transactio ns. — Geo logij . 



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'* g]^'" + 4^'^ ^"'' — A specimen of this mineral was col- 

 lected fi-om the Eolling Eiver, 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 h'om tailings of certain auriferous cements at 

 Lankey's Gully, Eeefton, 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 tiie 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 

 Museum through Mr. Blair, but this discovery has not been further con- 

 firmed. 



Cobalt. 



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^ .^4^ + 8H — This mineral is mentioned by 

 Dr. Hector (Jurors' Eep. N.Z. Ex., 1865, pp. 265, 437) as occurring in 

 the schists and gneiss of the West Coast of Otago. 



AsboUte. — This mineral, which is an earthy wad in which Cobalt frequently 

 occurs, is mentioned by Mr. J. A. Pond (Trans. N.Z. Inst., vol. x., p. 456) 

 as occurring in four distinct places in the Auckland district, but the locali- 

 ties are not cited. The highest return which he obtained was 2*42 per 

 cent. Cobalt. 



