BY W. F. PETTERD. 59 
externally from exposure. Some beautiful examnles have been 
obtained from the New England District of New South Wales. 
(Cox and Ratte, “ Mines and Minerals.’’) 
198. RANDANITE (Jnfusorial Harth). 
Found in small quantity; contains many fresh-water forms of 
Diatumacez. 
Inglewood, near Oatlands, (Burbury). 
199. STILBITE (Hydrated Silicate of Alumina and Calcium). 
In a mineral vein on the west side of the River Mersey, a few 
miles above Gad’s Hill crossing. 
200. SILLIMANITE (Anhydrous Silicate of Alumina). 
Occurs in small compact massive lumps of a brown to black 
colour with perfect and brilliant cleavage. It is translucent with a 
vitreous lustre. 
Bischoff. (W. R. Bell). 
201. SMITHSONITE (Silicate of Zinc). 
Found in small compact patches, yellow-brown colour and dull 
lustre. 
Bell’s Reward, Whyte River, and at the Heazlewood Silver-lead 
mine, Heazlewood River. 
202. SIDERITE (Carbonate of Iron). 
Occurs of sub-crystalline structure and pale brown colour, with 
quartz, both of which often contain gold. Specimen Reef mine, 
Brown’s Plain; in translucent masses of a vitreous appearance 
which rapidly weathers brown, also abundantly in the opaque form, 
but rarely in well-formed crystals, Mount Bischoff; in veins, 
usually of lenticular form and often containing Gold, Brown’s 
Plain, Lucy River, Rocky River, and other places in the vicinity 
of the Pieman. This mineral appears to be the principal 
auriferous matrix of the locality: on the surface it is usually 
decomposed to the oxide. Abundant near the River Forth in 
compact masses ; at Port Sorell it is found intermixed with quartz ; 
in great profusion at Zeehan, Dundas, and the Heazlewood, where 
it forms the common lode gangue of the Silver-lead mines. The 
crystals are rarely obtained, but at the last-mentioned field they 
are occasionally met with, but very small in size: it is more often 
met with in the lode cavities in semi-lenticular forms aggregated 
together. In the Heazlewood Silver-lead and adjacent mines it is 
commonly coloured pale green by the admixture of the oxides of 
Nickel and Chrome. 
203. STROMEYERITE (Sulphide of Silver and Copper). 
When pure this mineral contains about 52°), of metallic silver ; 
it crystallizes in the rhombic system, and is isomorphous with 
