156 THE MINERALS OF TASMANIA. 



The scheelite is greenish-grey in colour, opaque and vitre- 

 ous in appearance. It is irregular in deposition, often in 

 intergrown crystalline bunches, and well-formed crystals 

 singly and in groups are not rare, which show pyramidal 

 hemihedrism. Nothing practical has to date been done 

 to elucidate the geology of this find. 



The following is an analysis of the roughly concentrated 

 material, viz.: — Ca W04 — 65'3 per cent., which gave 

 W03 = 52*68 per cent.; the ore contained Ta^ O- = 2'6 

 per cent. It is apparently a contact formation or lode 

 intimately connected with the granite of the vicinity. The 

 scheelite occurs in thin seams, with small quantities of 

 associated molybdenite and native bismuth. 



Excellent pseudomorphs, partial and occasionally com- 

 plete, of this mineral to wolframite are not uncommon at 

 a locality about 1 mile east of south of Mayne's Tin Mine, 

 Heemskirk. They are perfect crystals in form, sometimes 

 only transmuted to a very limited degree; then, again, the 

 whole substance of the crystals may be changed to the iron 

 manganese — tungstate, in which case they assume the dull 

 surface appearance so generally typical of pseudomorphous 

 action. Some very nice crystals of the pure substance also 

 accompany the rest. These are from opaque to semi- 

 transparent, and of a pale-yellowish colour. With this find 

 wolframite also occurs in excellent crystals, both pure and 

 partially so. For information respecting these, see notes 

 under that mineral. A yellowish brown substance may 

 occasionally be detected as minute blebs and veins on the 

 scheelite in connection with this occurrence, which may be, 

 and apparently is, the hydrated tungstic oxide, mey- 

 macite (W03,2H2 0), which is formed by alteration. 

 It is not of any importance, except as a mineralogical 

 curiosity. Analysis made by Traube (Neue's Jahrb. Min. 

 Beil. Bd. VII., 1890, p. 232), of a sample of the scheelite 

 from Mt. Ramsay gave the following result, viz. : — 



99-42 



Specific gravity = 6-09 



Referring to a crystal from the same locality. Dr. Ander- 

 son remarks (" Records of the Australian Museum," Vol. 

 VI., Part 5, 1907) : " It occurs on hornblendic rock in well- 



