58 MINERALS OF TASMANIA. 
Bay ; Lake Sorell; Ilfracombe; Supply Creek ; Longford, and 
many other localities. 
193, RETINITE (?) (Fossil Resin). 
A brownish-yellow hydro-carbonaceous substance of semi- 
perlaceous lustre, very brittle, soft, and of uneven fracture. When 
heated melts to a dark brown varnish- like mass, burns with a 
yellow flame, during which it gives off much smoke: it emits a 
strong resinous aromatic odour. 
A sample of this material was submitted to Professor Krause, 
of the Ballarat School of Mines, who stated that it comes near to 
a fossil resin that has been named Middletonite, and that he found 
a similar substance in Victoria many years ago occurring between 
beds of coal, A partial analysis has been made by Mr. C. Burbury, 
who states that “it contains 1°75 °/, moisture at 100° C., and (by 
usual treatment of coal) 98°), of volatile Hydrocarbons.” 
Occurs above and impregnating beds of lignitic coal at 
Macquarie Harbour. 
A similar substance was obtained, also with lignite, in a clay- 
slate rock, which contained many leaf i impressions, at a depth of 
about 100 feet from the surface, at the Don Tin mine, Bischoff. 
A fossil resin has also been found in numerous small fragments in 
the lignite near Evandale Junction. 
194. RUTILE (Binoxide of Titanium). 
Abundant, but much rounded, in drift, Brown’s Plains; Savage 
River; about the south-west base of Mount Lyell; in waterworn 
fragments and occasionally as well-formed crystals with other 
Titanium minerals, Clayton Rivulet; in red-brown to black 
capillary bunches penetrating Quartz crystals, Moorina. 
195. RHODOCHROSITE (Carbonate of Manganese). 
This well-marked mineral is also known as Dialogite: it has 
been obtained at the Austral Silver-lead mine, Zeehan, in ferro- 
manganese gossan, the vughs often containing fine aggregations 
of the substance ; ; it also occurs massive in the fractures and in 
irregular botryoidal concretionary masses, lining cavities; it has 
also been found at the Maestrie’s Broken Hill mine at Dundas. 
196. RETINALITE (Yellow Serpentine). 
A massive resinous yellow variety of this well-known mineral 
substance. It is usually translucent. 
Dundas. 
197. RHODONITE (Silicate of Manganese). 
Information from Zeehan states that this mineral has been 
found there, but the statement requires confirmation. It usually 
occurs massive, opaque, and flesh-red in colour, often coated black 
