U 



11. Pyroclore (Columbate and titauale of calcium, lanthanum 

 ceruim, etc.). 



This rare mineral, or a species closely allied thereto, has 

 been discovered on the property of the Shekelton Mining 

 Syndicate near Table Cape. It occurs in a granular condition 

 of a brown colour in alluvial drift, with zircon, sapphire, and 

 •quartz. The Australian Mining Standard of October, 1896, 

 states that an analysis by Dr. W. H. Craze gave the following 



a variety of 



% 



12. Prosopite (Hydrous fluoride of aluminium and calcuim). 



Abundant as a white powdery substance at the " White 

 Face " at Mount Bischoff, apparently derived from the 

 decomposition of the topaz porphyry characteristic of the 

 locality. 



13. Pyrrhotite (Sulphide of iron). 



At the Colebrook Mine, North-East Dundas, this mineral 

 occurs in enormous quantity in the limurite rock ; with it 

 arsenopyrite and chalcopyrite are intermixed. It has, when 

 freshly broken, a shining bronze lustre, but on exposure 

 readily tarnishes, then often showing blue and red coppery 

 reflections. 



14. Sillimanite (A basic ortho-silicate of aluminium). 



In the " Catalogue of the Minerals of Tasmania," 1896, 

 this is mentioned in error as occurring at Mount Bischoff. 

 More recently it has been discovered by Mr. W. H. Twelve- 

 trees and myself as occurring' as sillimanite-schist at the 

 Lucy River, a tributary of the Pieman, and at Mount Stewart, 

 Heazlewood district. 



