Cox.—On the Mineralogy of New Zealand. 44] 
that the trachytic rocks, like those of Taranaki, and which may be looked 
upon as mineralogically allied to the granites and syenites on other grounds, 
also yield an ironsand having a small percentage of titanic iron. 
Where ironsands occur which are intermediate between the two extremes 
it is due either to a mixture of those derived from two distinct sources, or 
else the percentage of titanic iron has been increased by the presence of 
diabase or diorite dykes. 
Menaccanite.—Mr. Skey mentions the occurrence of this mineral (titani- 
ferous iron ore) from Brancepeth, Wairarapa (Sth Lab. Rep. p. 15). It 
occurs with felspar, by which it appears to have been cemented together. 
Iron Ochre occurs as a deposit from chalybeate springs and ferruginous 
waters in many mines both of coal, gold, and copper. 
Iron Pyrites, Fe".—This mineral is exceedingly widely distributed in New 
Zealand, indeed may be considered as general in its distribution. At Para- 
para, Collingwood, very perfect octahedral crystals are of common occur- 
rence over part of the limonite deposit previously mentioned, and cubical 
crystals are of frequent occurrence in the chlorite schists and lepidomelane 
schists of the metamorphic region of the West Coast and Wakatipu Lake 
district. 
It is of frequent occurrence as isolated crystals dispersed through the 
auriferous rocks of the Thames (tufanites), and also in many of the slates, 
and again forms an important element in the composition of many of the 
auriferous quartz reefs both north and south. 
It also oceurs as important lodes in the Collingwood district, where 
several of these are known to occur, and all that have been tested are more 
or less auriferous in character. These pyrites lodes are found— 
Ist. In felspathic slates which ace associated with the auriferous reefs, 
the largest yet known being about 4 feet wide. 
2nd. In the crystalline limestone; a reef in the Parapara River, above 
McGregor’s Creek, being at least 8 feet wide, and componsd of s fie grsiiest 
bind £E 
SoD nek st se 
compact pyrites. As I have previously point 
limonite deposits of the Parapara are also the back of a saci pyritous lode. 
At Mount Rangitoto, in Westland, a pyrites lode, with which is asso- 
ciated about 20 per cent. galena, occurs, and this is frequently highly 
auriferous, containing from 5 to 18 ozs. of gold per ton. It is associated 
With schists and granites. The late Mr. E. H. Davis has described (Trans. 
N.Z. Inst., vol. iii., p. 287) a new form of iron pyrites, probably a pseudo- 
morph, from the Chatham Islands. He says: “The system is oblique, 
nearly isomorphous with felspar, but having the clino-diagonal longer ; the 
niente ue and brilliant, are »P; OP; P; nPo hemidome, 
