Cox. — On the Mineralogy of Neiv Zealand. 



423 



better parts of this rock will probably prove a valuable ore of clirorae, and 

 some of second class quality may possibly be sufficiently concentrated to 

 render tliem of value. - 



Analyses of Chrome ores from the Nelson district show that an average 

 percentage of 50-62 Crg Og has been obtained from samples forwarded, and 

 that half of these yield over 55 % Crg O3, proving the Nelson Chrome ores 

 to be of considerable value. These analyses varied as follows from the 

 different localities : — 



Starveall 



Little Ben Nevis 



Aniseed Valley .. 



Maungatapu 



Adams Lode 



Croixelles 



Wangamoa 



Dun Mountain .. 



Lake Harris Eange, Otago 



44-21 per cent., Cra O3 

 40-62 to 59-52 

 41-16 to 42-65 

 30-18 to 64-26 

 51-61 to 64-63 



43-44 

 52-17 to 64-80 

 44-61 to 63-72 



61-24 



Chromite has been found at Jackson's Bay, where it also occurs as a 

 constituent of the rock Dunite. Specimens were first forwarded by Mr. D, 

 Macfarlane, Government Agent there, in 1877. 



It was also discovered by Dr. Hector, associated with Nephrite, in 

 Milford Sound, and is mentioned in the Jurors' Eeports N.Z. Ex., 1865, 

 p. 265, as follows : — 



" The large block of Nephrite, which weighs 200 lbs., and was brought 

 by Dr. Hector from Martin's Bay, is speckled with this mineral (Chromite) 

 in small grains. This interesting rock is therefore in all probability a local 

 variety of the Dunite, which forms the matrix of the Chrome ore in Nelson." 



Chromite of rich quality and granular structure has also been found at 

 Milford Sound as a rolled fragment ; it was associated with Steatite (Liver- 

 sidge, " Trans. N.Z. Inst.," vol. x., p. 504) as well as another specimen 

 from Moke Creek, Queenstown, and one brought by Mr. McKay from the 

 Lake Harris Eange, Otago, which yielded 61-24 °/q Crg O3. 



Ukanium. 



Uranium has not yet been found in New Zealand. 



Manganese. 



This metal occurs in nature chiefly in the form of various oxides, the 

 main divisions of which are the hydrous and anhydrous ores. 



Anhydrous Ores. 



Pyrolusite, Mu. — H. 2 to 2-5, colom- iron-black to dark steel-grey, some- 

 times bluish ; streak black ; opaque ; rather brittle. This mineral was dis- 

 covered on the east coast of the Auckland district, in 1873, a specimen 



