150 THE MINERALS OF TASMANIA. 



boulders. It is difficult to account for this granular 

 growth, which appears to be in layers one over the other, 

 and has the appearance of a siliceous oolite. The con- 

 cretionary spherules are individually about 1 mill, in 

 diameter." (L, K. Ward.) 



"A finely fibrous, somewhat silky-looking variety of this 

 mineral, in interlaminations up to J-inch thick, much 

 resembling some aragonite deposit-ed from thermal springs, 

 occurs in the Australasian Slate Quarry, Back Creek." 

 (Ulrich.) 



Endomorphs in quartz, which is usually more or less 

 cloudy in appearance from enclosed substances : — 



Rutile. — Moorina ; Mt. Cameron. 



Cai^siterite. — Gould's Country. 



Tourmaline. — Ben Lomond; Moorina; Mt. Heems- 



kirk. 

 Iron Oxide. — In capillary fibres (known as venus hair 



stone), Kindred-road, near the River Forth. 

 Manganite. — In solid dendrites 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. Mt. Cameron, Gould's 

 Country, Moorina, Thomas' Plains, Lefroy, Mt. Maurice, 

 Mt. Heemskirk, Beaconsfield, Dundas, Ben Lomond, 

 Flinders and other islands in Bass Strait, and other 

 localities. 



Cairngorm. — Smoky-brown of various shades. Blue 

 Tier, Moorina, Mt. Cameron, Flinders Island, &c. 



False Topaz. — Of a clear pellucid yellow colour. Mt. 

 Cameron, Moorina, Gould's Country, &c. 



HyaUite. — This variety has been found in the form of 

 beautiful globular concretionary masses and incrustations 

 with a pearly lustre. Zeehan, Gould's Country, Rio Tinto 

 Mine (Savage River). '' Occurs in small mammillary 

 colourless transparent coatings in hollows of the basalt 

 near Surrev Hills Station on the road to Mt'. Bischofif." 

 (Ulrich). 



Resinite. — A form of semi-opal of dull-brown colour and 

 resin-like appearance. Flinders Island. 



Wood 02^d. — Silicified wood, usually of a pale- 

 brown colouration, with a striated structure. In 

 drift, Derby; Flinders Island; Epping Forest; Long- 



