138 THE MINERALS OF TASMANIA. 



lar patches in the veinstone of the Heazlewood Silver-lead 

 Mine, attached to sideritC;, which is itself often stained 

 green by chrome and nickel ; it also occurs as an incrusta- 

 tion on other nickel minerals near Trial Harbour, West 

 Coast. 



248. Finite (Hydrous Silicate of Aluminium and Potas- 



sium). 



Under this name are included many amorphous altera- 

 tion products of various minerals, such as felspars, micas, 

 and others. The chemical composition practically repre- 

 sents muscovite. As occurring in this island it is in the 

 form of irregular lumps, which are a close representation 

 of that peculiar variety of quartz which is known as 

 " slashed " or " chopped " quartz, occasionally found in 

 the stanniferous drift of the eastern tin mines, as well 

 as in the auriferous drift of the Lisle goldfields. The 

 pinite apparently filled cavities that had been in the 

 granite, and taken impressions of angular crystals, which 

 protruded from the walls of the cavity. This substance 

 has occurred at Moorina and other localities. 



249. Pitticite f Arseniosulphate of Iron). 



A doubtfully homogeneous amorphous substance, of a 

 dark, almost black, colour, and greasy lustre, that would 

 appear to result from the alteration of arsenopyrite. It 

 occurs in limited quantity in the vicinity of the Scamander 

 River; at Mt. Pelion (Montgomery); and at North-East 

 Dundas it occurs as a thin coating, of an intense brown 

 colour, on niccolite. 



250. Plagionite (Sulphantimonite of Lead). 



This mineral occurs as indistinct small tabular crystal- 

 lisations, that are grouped together in druses, and as 

 irregular massive specimens of small size. In colour the 

 samples obtained are of a dark-grey, but are generally 

 much tarnished. 



Locality : The Heazlewood Silver-lead Mine. 



251. Platinum, Native. 



This metal has been reported to occur at St. Paul's 

 River ; at the Pieman goldfield ; as minute flakes in 

 auriferous wash at Salisbury, near Beaconsfield, and at 

 Wilson's River (which is a tributary of the Pieman). All 

 the identifications are doubtful, and need confirmation. 



