56 MINERALS OF TASMANIA, 
originates from the decomposition of Pyrites: masses of a similar 
character have been found at the Pieman River and other places. 
At the Vale of Belvoir Quartz occurs pseudomorphons after 
Tremolite and silicified wood, which is of similar origin ; is aban- 
dant in many places. At Ben Lomond, in the workings of — 
one of the tin mines, quartz has been found pseudomorphous after 
Felspar ; the specimens have a peculiar mottled appearance of 
various shades of brown. 
Endomorphs in quartz, which is usually more or less cloudy 
in appearance from enclosed substances :— 
Rutile.—Moorina ; Mount Cameron. 
Cassiterite.—Gould’s Country. 
Tourmaline.—Ben Lomond; Moorina; Mount Heemskirk. 
Iron Oxide.—In capillary ‘fibres (known as Venus Hair 
Stone), Kindred Road, near the River Forth. 
Manganite——In solid dentrites in semi- opal, North-east 
Coast. 
Principal varieties of Quartz. 
Rock-crystal.—Vitreous form with a glassy appearance, 
commonly transparent and colourless, but occasionally tinted with 
yellow and brown. Mount Cameron; Gould’s Country; 
Moorina; Thomas’s Plains; Lefroy ; Mount Maurice; Mount 
Heemskirk; Beaconsfield; Dundas; Ben Lomond; Fiinders 
and other islands in Bass Straits, and other localities. 
Cairngorm.—Smoky-brown, of various shades. Blue Tier; 
Moorina; Mount Cameron; Flinders Island, &c. 
False-topaz.—Of a clear pellucid yellow colour. Mount 
Cameron; Moorina; Gould’s Country, &c. 
AH yalite.—This variety has been found in the form of beautiful 
elobular concretionary masses and incrustations with a pearly 
lustre. Zeehan; Gould’s Country. 
Resinite—A form of semi-opal of dull brown colour and 
resin-like appearance. Flinders’ Island. 
Wood-opal.—Silicified wood, usually of a pale brown colour- 
ation, with a striated structure. 
In drift Derby ; Flinders’ Island; Epping Forest ; Longford; 
Launceston ; in concentric layers, Branklia Rivulet ; East Arm of 
Port Sorell; near Latrobe: Kentish Plains; white, of a fine 
silky fees Queen River, east of Howard’s Plain; of bright 
colouration and compact form, Little Forester River; Lake 
Sorell ; Conara ; Swansea ; pseudomor phous after stems, Hobart; 
(Ballarat School of Mines Museum). 
Cacholong.— A milk-white compact siliceous substance occur= 
ing as thin veins and filling cavities in Basalt; it is opaque and 
usually somewhat dull in lustre. Near Launceston. 
Phrase-—Amorphous, usually of a yeliowish-brown waxy 
lustre, Hampshire Hills; as brown to dark-green waterworn pebbles, 
