BY W. F. PETTERD, C.M.Z.S. Ill 



well-formed crystals are not rarely obtained ; abundant at 

 South Mt. Darwin. '" A massive intensely black and shin- 

 ing magnetite, which shows strong polarity, occurs in con- 

 nection with the serpentine at the Serpentine Hill, over the 

 Argent tunnel, on the Emu Bay Railway Company's line. 

 It often shows a fibrous structure^, which is at times 



remarkably distinct, and may be dislocated 



In the serpentine of Dundas and North Dundas there 

 is a notable development of fibrous or columnar magnetite 

 in veins throughout the rock. The fibres and columns are 

 usually straight, and stand at right angles to the course 

 of the veins. At times they are strangely contorted into 

 sinuous curves. The magnetite is commonly polar." 

 (L. K. Ward.) 



There are less important occurrences of magnetite at 

 several other localities. 



189. Malachite (Green Carbonate of Cojp'per). 



This mineral, which is so abundant in several of the 

 mining districts of Australia, is here comparatively rare, 

 and only known to occur ni a thin coating or incrustation. 

 Heazlewood ; Cascade; Mackintosh River ; Badger Head ; 

 Frankford, &c. Eastern Proprietary property, Scamander 

 River, in a mammillated form, with pyrite and chalco- 

 pyrite. 



190. Manganite (Hydrous Manganese Sesqvioxide). 

 This material crystallises in the orthorhombic system. 



It occurs in bunches of striated columnar crystals, whch, 

 under favourable conditions, are among the most perfect 

 examples of mineral crystallisation. It also occurs massive 

 and radiating. 



As small bunches of well-formed crystals. Hampshire 

 Silver Mine. 



191. Mariatite (Sulphide of Zinc and Iron). 



This is a variety of blende, portion of the zinc being 

 replaced by iron. It is dark-coloured, almost black, with 

 sub-metallic lustre. 



Star of Peace Tin Mine, Cascade; Rex Hill, near Ben 

 Lomond ; Mt. Bischoff ; and other localities. 



192. Marcasite (Sulphide of Iron). 



This extremely variable mineral, both as regards com- 

 position and habit of occurrence, is also known as 



