30 MINERALS OF TASMANIA, 
96. GRAPHITE (Impure Carbon). 
Of common occurrence, but invariably of indifferent quality 
and usually in the form of graphitic slate. 
It is often met with in the silver-lead lodes of Zeehan and 
Dundas, where it is usually found on fissure lode walls more or less 
intermixed with earthy matter and on the cleavage faces of Galena ; 
Norfolk Plains (Pro. Royal Soc., Tas. 1851), near Mangana ; 
Mt. Heemskirk, in the cleavages of the granite rock; Beacons- 
field; Anderson’s Creek; North Valley at Bischoff, as a large 
mass with a high metallic lustre ; on the beach about two miles 
west of the Leven River; as thick coatings in the joints of a 
crystalline limestone on the Wilmot River ; reported as occurring 
in considerable quantity at Barren Island. 
97. GROSSULARITE (a variety of Garnet). 
Occurs as a subcrystallized to somewhat solid rock near Mount 
Claude. The colour is pale olive-green to brown, with a rather 
vitreous lustre. 
98. GREENOCKITE (Sulphide of Cadmium). 
This has been reported to occur at the Godkin mine, Heazle- 
wood, implanted upon Sphalerite and lode-matter. (A. R. 
Browne). 
99. GOETHITE (Hydrated Peroxide of Iron). 
A good mineral species, crystallizing in the rhombic system. 
It may be known from other iron minerals by its blood-red colour 
when seen by transmitted light, and brownish yellow-streak. It is 
commonly globular and stalactitic, rarely in crystallized masses. 
Dial Range; Blythe River; Penguin; Dundas; Pieman 
River; Emu Bay. 
100. GALENITE (Sulphide of Lead). 
This mineral, the most abundant ore of Lead, is widely dis- 
tributed over the northern and western portions of the island, 
occurring in all its many variations of structure, from the steel- 
grain to the coarse cubical ore, often showing extreme variations 
in this respect in the same district or even individual mines. In 
geological occurrence it also varies to a greater extent than almost 
any other mineral species; here it is common to the tin-bearing 
eranites of the Ben Lomond and the fossiliferous Silurian slates 
of the Zeehan districts. 
From all localities our Lead Sulphide is characterised by the 
unusually large assay returns of Silver that it yields, so that it is 
reasonable to anticipate that it will become one of our most important 
economic minerals. The true crystals are exceptionally rare, and 
the few that have been obtained are small and obscure. This 
mineral often contains a considerable admixture of Antimony, in 
