155 



Grypsum crystals are very character istic* 9427, a pretty 

 specimen from Talbragar; and 8016, from Hinton, sliow these 

 crystals. Also crystals from Grewrie. 



Twin Crystal of Gypsum. 



(See page 55 ; foot-note.) 



A fibrous variety is exhibited from Jenolan and Thackaringa.. 



In the far west of New South Wales an earthy form of gypsum 

 frequently occurs in the vicinity of extinct mud-springs ; several' 

 examples of these from the Bourke district will be noticed. 



750, Canada ; a clear variety. 



794, Suez Canal ; very transparent. 



Further specimens of gypsum will be found in cases 103, 104, 

 and 105. 



Sulphate of strontia. Bristol (Eng.), Canada, Sicily (with Celestite. 

 native sulphur). 



Nodules have been found in the Bourko District. 



Sulphate of haryta ; a very common mineral often mistaken Barytes. 

 for scheelite on account of its great weight. It is used in the 

 manufacture of paint (see case 110). Canada; Northumberland 

 (Eng.) 



1315, Alston Moor (Eng.), showing the characteristic tabular 

 form of the crystals. 



• A good crystal of gj'psum will be found in case 33. 



