70 THE MINERALS OF TASMANIA 



olivine. Its crystallisation period was at a late stage in the 

 consolidation of the rock. 



121. EuLYTiNE (Silicate of Bismuth). 



A very rare mineral, occurring in minute globular 

 patches, of a yellow to brown colour, with a resinous lustre 

 It was identified by the late Professor Ulrich. 



Locality: Hampshire Silver Mine (W. R. Bell). 



122. EvANSiTE (Hydrated Phosphate of Aluminium). 



A rare species, occurring as botryoidal incrustations 

 which are often almost colourless, but sometimes milky- 

 white, at all times having an attractive pearly lustre. The 

 examples were obtained in a silver-lead lode with galena 

 and sphalerite. 



Analysis of this mineral from Zeehan, by Mr. H. G. 

 Smith (Pro. Roy. Soc, N.S.W., 1895): — 



99-57 



This mineral also occurs at several localities at Dundas. 



123. ExcHERiTE (Basic Calcium, Aluminium, and Iron 



Silicate). 



This variety of epidote appears to be somewhat abundant 

 on the Upper Emu River, opposite the north-west shoulder 

 of Valentine's Peak. The crystals are at times quite half 

 an inch in length, but are commonly broken and decom- 

 posed. Flakes of molybdenite sometimes occur disseminated 

 in the masses of the substances. It is associated with 

 massive white wollastonite. 



124. Fahlunite ( IJ ydromica). 



Several forms of the hydro-mica group occur at Mt. 

 Bischoff, the Hampshire Hills, Mt. Lyell, and elsewhere. 

 The identification of the species is at the best doubtful in 

 almost all the members of this very unsatisfactory group. 

 The Bischoff samples are soft, compact, and grey in colour; 

 that from the Hampshire is much darker, almost black in 

 colour, with a shining surface. 



