51-08 



56-00 



12-43] 



11-13 



1-42 J 





9-00 



9-94 



21-35 



21-96 



traces 



traces 



•97 



•97 



Cox. — On the Mineralogy of New Zealand. 395 



occurs as veins traversing serpentine and hornblende schist, one variety 

 being speckled with chromic iron. It is found as boulders, sometimes of 

 great size, in the auriferous wash of a few localities on the West Coast, such 

 as the Kumara diggings, on the banks of the Teremakau River, and the 

 Greenstone diggings near Lake Brunner. Two analyses of this mineral, 

 quoted by Dr. Hector (Jurors' Rep. N.Z. Ex., 1865, p. 413) give the follow- 

 ing composition : — 



Silica 



Protoxide of iron, with traces of 



manganese and chromium 

 Alumina 

 Lime 

 Magnesia 

 Soda 

 Water of constitution 



96-25 100-00 



Diallage, (Ca, Mg, Fe) Si. — The first mention of this mineral in New 

 Zealand is by Dr. Hector (Jurors' Rep. N.Z. Ex., 1865, pp. 266, 438) as 

 occurring in diorites on the West Coast, and during his trip round the West 

 Coast Sounds in 1863, he collected specimens in gabbro from Hokuri Creek, 

 Martin's Bay, Lake McKerrow, and the head of Kakapo Lake ; he again 

 mentions it (Trans. N.Z. Inst., vol. ii., p. 377) as dykes in the Dun Moun- 

 tain. It is mentioned by Dr. v. Haast as occurring in gabbro in the Mt. 

 Torlesse Range and Upper Rakaia (Jurors' Rep. N.Z. Ex., 1865, p. 257) ; 

 by Mr. J. C. Crawford in reefs traversing mesozoic limestones at Waike- 

 kino (Trans. N.Z. Inst., vol. ii., p. 351) ; by Mr. E. H. Davis, at the Dun 

 Mountain (Greol. Rep., 1870-71, p. 112) ; and again by Prof. Liversidge in 

 his description of the minerals in the Otago Museum (Trans. N.Z. Inst., 

 vol. x., p. 496), from Lake McKerrow and Dun Mountain. There is a 

 specimen in the collection of the Colonial Museum, from Kakapo Lake, of a 

 dark-green colour and metalhc lustre, which is not well marked, corre- 

 sponding with the specimen described by Prof. Liversidge from Lake 

 McKerrow. 



Hypersthene, (Mg, Fe) Si. — This mineral is mentioned by Dr. Hector in 

 diorite rocks on the West Coast (Jurors' Rep. N.Z. Ex., 1865, pp. 266, 438), 

 and was collected by him from Warp Point, Kaduku River, in 1863. It is 

 again mentioned by Dr. v. Haast in hypersthenite, Malvern Hills (Jurors' 

 Rep. N.Z. Ex., 1865, p. 257) ; by Mr. E. H. Davis at the Dun Mountain 

 (Greol. Rep., 1870-71, p. 112) ; and by Prof. Liversidge as occurring in the 

 collection of the Otago Museum from Warp Point, Kaduku River (Trans. 

 N.Z. Inst., vol. x., p. 497). 



