8 MINERALS OF TASMANIA. 
28. ANORTHITE (a white Silicate of Alumina and Lime). 
Whyte River, in limited quantity. 
29. BITUMINOUS SHALE. 
Argillaceous shales of a more or less bituminous character and 
of various shades of brown and black occur at several places. 
They are all inflammable tosome extent ; so far they have not been 
determined. 
Ben Lomond; Dilston; Beaconsfield; Piper River; George 
Town; Heazlewood; Blue Tier; Inglis River; Gad’s Hill; 
and other places. 
30. BEAUXITE (Hydrated Oxides of Alumina and Iron). 
A substance from Port Davey, agrees fairly well with the 
general characteristics of this mineral, although the identification 
is doubtful. 
31. BOURNONITE (Sulphantimonite of Lead and Copper). 
Occurs in patches near the junction of the slates and granite on 
the south-east shores of King’s Island (Gould, Pro. Royal Soc. 
Tas., 1871). 
32. BERYL (Silicate of Alumina and Glucina). 
The true emerald has not so far been found here, but hexagonal 
prisms that are colourless to bluish-green have been obtained at 
Flinders Island, also in stanniferous drift as water-worn pebbles 
at Mount Cameron. At the last locality a fairly good example 
was obtained some years back. It consisted of portion of a crystal 
about an inch in diameter and the same in length. It had the 
true hexagonal form and characteristic cleavage. The colour was 
dull green with a translucent appearance. The stone was mistaken 
by the miners for a peculiar form of Copper ore. More recently 
another specimen was obtained in the drift of almost the same 
colouration, rather less in diameter, but nearly three inches in 
length. 
33. BRONZITE (See EnstaTiTE). 
34. BASANITE (variety of Quartz). 
This is the Lydian or touchstone, a compact black quartz. The 
stone was used for testing the purity of gold by rubbing the metal 
upon a smooth surface, the colour of the streak indicating the 
amount of impurity. 
Swansea; Conara. 
39. BROOKITE (Titanic Oxide). 
This species is of the same composition as the more abundant 
Rutile, but crystallizes in the orthorhombic system. It occurs with 
