BY W. F. PETTERD, C.M.Z.S. 201 



fibrous structure. At the Shepherd and Murphy Mine, 

 Bell Mount, it is found in patches and veins in the garnet 

 rock. 



346. WuRTZiTE (Hexagonal Zinc Sulphide). 



A rare zinc mineral, differing in crystallisation from 

 sphalerite. It is hemimorphic in habit, and by that char- 

 acter may be recognised when in crystals. Usually it 

 occurs in columnar masses. Hercules Mine, Mt. Read; 

 and Magnet Silver Mine, Magnet. 



347. Yanthosiderite (Hydrous Sesquioxide of Iron). 

 This oxide of iron is found as an incrustation, often in 



silky needles of a bright-red colour, but usually occurring 

 in a powdery form. It is abundant coating the vughs m 

 and on the harder portions of the gossan capping the lode 

 at the Magnet Mine. It is often found exuding from the 

 roof and walls of old mine workings, as is the case at the 

 Farrell Mine, at Tullah. 



348. Yttrocerite (Hydro fluoride of Calcium, Yttrium, 



a7id Cerium). 



This is a rare mineral, occurring in amorphous mas&es 

 of small size, which usually exhibit a subcrystallme surface. 

 It is reddish-brown in colour, and occurs imbedded m the 

 ^mphibolite rock peculiar to Mt. Ramsay. (W. R. Bell-) 



In writing about this mineral the late Professor Ulrich 

 remarked, "I have a suspicion that this mineral has 

 probably been mistaken by Mr. Bell for either axmite or 

 titanite, both of which I identified in the Mt. Ramsay 

 amphibolite." 



349. Zaratite (Carbonate of Nickel). 



This mineral is also termed '' emerald nickel," from its 

 beautiful green colour. It occurs as varnish-hke coatings, 

 and as thin incrustations on chromite and magnetite, being 

 constant to one or the other. It more rarely fo^^^^mammil- 

 lary or stalactitic crusts on the same minerals. Although 

 containing 59-6 per cent, of nickel protoxide, it is too 

 aincommon in nature to be of any commercial importance 

 as an ore of the metal. It is probably more profuse at its 

 only known locality in this island, m a high hill on the 



