180 THE MINERALS OF NEW SOUTH WALES. 



JSi'OoJcite. — Which is an allotropic form of titanic acid, crystal- 

 lizing in flattened forms belonging to the rhombic system, has also 

 been found in New South Wales. 



In the diamond drift near Mudgee as flat, transparent, red and 

 translucent reddish-white plates, with striated surfaces. H = 6, 

 and sp. gr. = 4-13. Chem. comp. : Pure titanic acid, except a minute 

 trace of iron oxide (Dr. Thomson). 



Anafase. — A third allotropic form of titanic acid, crystallizing in 

 tetragonal pyramids. This has been found at the dry diggings of 

 Burrandong. 



Sphene. 



A calcium silico-titanate. Locality is uncertain ; I have met 

 with but one well crystallized specimen, of a green colour. 



Tungsten. 



Wolfram. 



Iron and manganese tungstate = (FeMn) W0 4 . It is found in 

 rolled masses in association with tin-stone in many parts of New 

 England. It is also found in situ in the quartz veins on Elsmore, 

 Newstead, and other places, in the usual form of imperfectly 

 developed tabular crystals. It is commonly accompanied by iron 

 pyrites. 



Scheelite. 

 Calcium tungstate = CaTi0 3 . Probably occurs in New England. 



Molybdenum. 



Molybdenite. 



Chemical comp. : Molybdenum sulphide MoS>. 

 Usually found massive with a coarsely granular structure; also in 

 grains, scales, plates, and rosette clusters of crystals. Sometimes 

 the flat hexagonal plates or crystals are of large size ; I have found 

 some as large as a half-crown on the Elsmore Tin Mine. 



The colour is usually bluish-white, witli a strong metallic lustre. 



Associations. — It is rather common in the New England tin 

 districts, especially at the Elsmore and Newstead tin mines, where 

 it occurs in the tin veins traversing the granite. It is most usually 

 associated with quartz. On the Hunter Piver it is found associ- 

 ated with gold, galena, pyrites, and other minerals. 



Localities. — It also occurs at Bullin Flat, near Goulburn, at 

 Kiandra with quartz, and Cleveland Bay. 



