114 



South 

 Australia 



"West 



Australia, 



Penaiig. 



Among tLe numerous sioecimens exhibited, tte following may 

 be noted : — 

 Tasmania. 6743, Eoy's Hill ; associated witli tourmaline. 



7617, Mount Housetop ; stream tin containing minerals of the 

 rare earths. 



5958, Eix Hill, Ben Lomond : with blende. 



5948, Commonwealth Mine, North Dundas ; with magnetic 

 pyrites. 



Mount BischofE is well represented. 5938 and others illustrate 

 the topaz rock, so characteristic of this mine. (See page 171.) 



Tin-bearing pegmatite and other ores from Port Darwin and 

 the Northern Territory. 



Varieties of stream tin from Greenbushes. The Greenbushes 

 ore contains minerals of the rare earths. 



Varieties of stream tin. 



United States. Stream tin from South Dakota and "Wyoming. Among the 

 lode specimens those from Dakota should be specially noted from 

 their resemblance to the Barrier Eange ores ; 3229, for instance, 

 a pegmatite with much light-coloured mica and dull-looking 

 massive tinstone could not he distinguished from an ore like 

 7970 from Poolamacca (case 64.) 



Numerous ores from different mines and levels. 



555, and others, show good crystals. 6216, St. Agnes ; loood- 

 tin ; polished specimen. 



The Erzegebirge Mines are represented by the following : — 



8707, 8710 ; tinstone associated with molybdenite. 



8648 ; tinstone in topaz rock. 



8647 ; tinstone in topaz rock. In this specimen the topaz has 

 undergone alteration into a hydrous mineral — gilhertite. 



8686 ; granite impregnated with tinstone — the " zwitter " 

 structure of the Germans. 



Corn-wall. 



Saxony, 



