69 



1637, Pheasant Creek : a variety of granite {greuen) heavily GaS6 64. 

 charged with tinstone. This variety of granite contains much 

 mica (the silvery-white mineral), but practically no felspar. K^o 

 doubt the felspar was destroyed by the same solutions that 

 brought m the tinstone. 



1637, Bismarck Eeef , Tingha : granite traversed by a vein of 

 quartz, on one side of which lies a vein of tinstone that has sent 

 olfshoots into the granite. 



1649, Old Gulf Lode : represents another type of lode tin ; 

 in this there are no veins, but the granite rock has been 

 impregnated with the tinstone without appreciable loss of 

 felspar. 



5355, Old Gulf Lode : tinstone associated with much beryl 

 (the pale greenish blue mineral). Several smaller specimens of 

 tinstone with beryl will be found in this case. 



1663, Great Britain Mine, Emmaville, is quite another class of 

 stone The rock is an igneous dyke — quartz-felsite — somewhat 

 like the elvan of the Cornish tin-mines, and the tinstone coats a 

 joint-face. 



1633, Torrington Mine : another instance of felspathic country 

 rock impregnated with tinstone ; small cavities lined with crystals 

 of tinstone will be noticed. 



1652, quartz-felspar-porphyry, the country rock of the Ottery 

 Lode. 



7964, Wall Creek, Black Swamp : a good instance of rich tin- 

 stone with quartz gangue. 



7933, The Grampians : a vein of quartz flanked with tinstone 

 ■on either side. 



7936, a 2-inch quartz vein, carrying tinstore, traversing a 

 fine-grained granite : it should be noticed how the quartz crystals 

 have grown inwards from the sides of the fissure without quite 

 filling it up. 



