46 MINERALS OF TASMANIA. 
At Dundas this ore gives high assay returnsin Silver, which metal 
probably occurs as an intermixed Chloride. 
139. MELACONITE (Black Oxide of Copper). 
Rarely found in large quantity: its common mode of occurrence 
is as a thin coating upon other Copper minerals. 
Star of Peace and Lone Hand mines, Cascade. At the latter 
locality it was met with disseminated and filling small pockets in 
the granite, often occurring with Chalcopyrite and Cassiterite ; 
Penguin Copper mine with Pyrites and Grey Sulphide of Copper; 
Saxon’s Creek, near Frankford, in the clefts of lode quartz with 
cupriferous Pyrites. 
140. MATLOCKITE (Oxychloride of Lead). 
In tabular crystals of a greenish-grey colour, apparently rare. 
Associated with mixed Sulphide and Carbonate ores. Sylvester 
Mine, Zeehan (A. J. Taylor). In small plates of a honey-yellow 
colour attached to Galena. 
Montana 8. M. Co., Zeehan. 
141. MUSCOVITE (Potash Mica). 
Foliated and flexible, from the Granite district between St. 
Valentine’s Peak and Housetop Mountain (Pro. Royal Soc. Tas., 
1851); in concretionary masses and crystals which are occasionally 
nearly one inch in length, Hampshire Hills; common in fair sized 
flakes, Flinders Island; George’s Bay vicinity; West Coast; 
abundant on East Coast, in some places of a bright golden colour 
in minute flakes; Gould’s Country. In the majority of stanniferous 
rocks, such as the Granites and Greisens, the Mica contains 
strong traces of the element Lithia. This mineral is the common 
light-coloured Mica so abundant in our Granite districts, of which 
rock it is an important constituent. 
142. MOLYBDENITE (Sulphide of Molybdenum). 
Abundant with Cassiterite at the Lottah and other mines at 
Blue Tier; Mount Heemskirk; at a locality six miles east of 
Hampshire and west of the Blythe River, with Magnetite and 
Hornblende (W. R. Bell); South Flinders and Cape Barren 
Islands; as small flaky masses in Quartz at the Iris River, 
near Middlesex; sparingly in Felspar at the Western Bluff; 
Castra, in felspathic porphyry; in Garnet rock, Upper Emu 
River ; in atough siliceous rock with columnar Hornblende at 
Heighwood, on the Upper Blythe River; Whyte River, with 
Garnet and Hornblende; Schouten Island. 
143. MOLYBDINE (JMolybdic Acid or Oxide). 
Obtained in small quantity as a pulverulent incrustation of a 
clear yellow colour and dull earthly appearance on a hard dark 
