EXPLANATION OF PLATE XVIII. 



Topaz. 



Fitr. 1. Emmaville, New South Wales. 

 Fig. 2. Oban, New South Wales. 

 Figs. 3, 4. Moiinfc Cameron, Tasmania. 

 Figr. .5. Flinders Island, Tasmania. 

 Fig. 6. Bell Mount, Tasmania. 



Forms:—? (001), h (010), m (110), M (230;, / (120), tt (250),^ (130), 

 d (201), h (203), X (043),/ (021), y (041), o (221), « {Ul),'i (223). 

 X (243). 



