42 | MINERALS OF TASMANIA. 
Abundant at the Vale of Belvoir as a secondary formation in 
concretionary masses, often of peculiar form and _ variously 
coloured; plentiful at Zeehan and Dundas, often forming portion 
of the cappings of argentiferous lodes ; abundant at the Heazle- 
wood; Meredith Range ; Savage River; Ilfracombe; Beacons- 
field; "Blythe ; Dial Range ; Mount Claude; Middlesex ; Mount 
Housetop ; ; Mount Lyell; King River: Mount Ramsay; in fine 
cubes after Pyrites, Savage River: ; and many other localities. 
Limonite is not a oood mineral species, as the amount of 
hydration varies very “much and it does not crystallize. The 
streak is always yellow, by which it may be known from Hematite 
and Magnetite. It often forms a cementing medium in breccias 
and conclomerates. 
124. LEPIDOMELANE (Silicate of Iron, Alumina, and 
Potash). 
A dark coloured variety of Mica occurring in Granite near the 
contact of plutomic and sedimentary rocks. 
Mount Heemskirk ; North-east Coast. 
125. LABRADORITE (Silicate of Alumina, Calcium, and 
Soda). 
A variety of Felspar ; it is a well known constituent. of certain 
rocks. Occurs in a blue slate in detached crystal forms. Arthur 
River near its junction with the Hellyer. (W..R. Bell.) 
126. LIGNITE (Brown Coal). 
A semi-formed coal, retaining the texture of the wood from 
which it wasformed. Bischoff; Breadalbane; Evandale ; Mac- 
quarie Harbour; Launceston; Young Town; Pig Island, and 
other places. 
At Beaconsfield a peculiar variety is found, that appears to be 
close to a form that has beennamed Dopplerite. It isan extremely 
brittle, intensely black, highly polished, jet-like hydro-carbonaceous 
substance, that has heen obtained from the Tasmania and other 
gold mines at Beaconsfield. It occurs at considerable depth from 
the surface in the workings of the mines, which are in Silurian 
strata and apparently originates from infiltrated water charged 
with organic matter. A mineral with much the same appearance 
and nature has been found in the Bischoff Silver-lead mine; it 
occurred filling cleavage planes and in vughs in the lode gangue; 
at the Upper Arthur River, about three miles from Bischoff, a 
similar substance occurs in a hard siliceous rock, again filling 
cavities. 
127. LITHOMARGE (Hydrated Silicate of Alumina). 
A soft unctuous clay-like substance, more or less coloured by 
Tron Oxide, 
