OCCUERING IN TASMANIA. 83 



76 Variscite. — (Hydrous phosphate of aluminhim.) 



As incrustations, often with a uniform surface. 

 General character somewhat dull, but of a bright 

 emerald-green colour, and thus sometimes mistaken 

 for an ore of copper. 



Associated with wavellite. Back Creek. 



Implanted in the cleavages of quartz. Lefroy. 



77 VoLTZiTE. — {Oxy sulphide of zinc.) 



Formed as an incrustation of a thin lamellar struc- 

 ture and globular; colour, clove-brown. Very- 

 Rare. Silver Crown Mine, Zeehan. 



78 Wavellite. — {Hydrous basic phosphate of alu- 



?niniu7n.) 



Occurs in small white discs, with the characteristic 

 radiating structure implanted in the cleavages of 

 sandstone. Ballast Quarry, Zeehan — Comstock 

 Line. 



79 Wolfram. — (Tungstate of iron and manganese.) 



An unusual occurrence 'df this mineral is in small 

 patches, associated with stannite and pyrite, at the 

 Oonah Mine. Zeehan. 



Occurs in the form of small brown crystals in quartz. 

 Mt. Bischoff Mine. 



80 Zeuxite. — {A ferriferous tourmaline.) 



A peculiar variety of tourmaline of a dark green 

 colour, of remarkable habit. It is confined to and 

 characteristic of the tin-deposits of Mt. Bischoff, 

 where it occurs in great abundance, often forming 

 rock masses of considerable size. Its common habit 

 is in short acicular crystals, which are interlaced 

 together into irregular bunches. Both colour and 

 habit are very constant. 



