38 MINERALS OF TASMANIA. 
Upper Arthur River it forms a rock of fine texture and intense 
black colour ; at the head of the Savage River it occurs in large 
quantity as a rock of medium texture and dark colouration; at 
Dundas semi-serpentised Hornblende occurs as well as_ the 
characteristic form. | 
The crystals of Hornblende are always elongated, which is 
an important difference between that mineral and its congener 
Augite. 
108. HALLOYSITE (Hydrated Silicate of Alumina). 
Contains more Silica than Kaolin and more Alumina than 
Smectite, but all are very unsatisfactory species, as they certainly 
merge one with the other. 
When containing an admixture of iron oxide it varies to a 
substance that is known as Bole. 
Mount Claude ; Mount Cameron:; Heazlewood; Blue Tier ; 
of a greenish-white colour with brecciated Ankerite, Dolomite, 
and Pyrites, Dundas; with Galena and Siderite, Dundas and 
Zeehan. . 
109. HALITE (Chloride of Sodium). 
Occurs as a powdery incrustation, usually very impure. 
Salt Pan Plains. 
110. HEMATITE (Peroxide of Iron). 
One of the most abundant and diffused minerals; it occurs in 
vast quantity at many localities, more especially throughout the 
northern portion of the island. Almost all the many forms it 
assumes have been obtained in more or less profusion; these may 
be divided into four principal groups, viz :— 
1. Specular Iron—the crystallized form. 
“ Hepatic form in well defined crystals in the south end 
of Flinders Island, on the beach in Basalt, south- 
west of Mount Eliza,’ (Gould, Pro. Royal Society 
Tasmania, 1871). Forth River; Black Bluff Mountain; 
Arthur River, near the Hellyer; Dial Range, with 
manganese oxide; Mount Lyell; Ilfracombe ; Blythe, 
Leven, Forth, and Penguin Rivers; Meredith Range ; 
at Ilfracombe a variety occurs which has been termed 
“Needle Ore,” the crystals are often of considerable 
size and much intermixed. 
2. Massive, or Red Hematite. 
Forth River, near its junction with the Dove; it is 
foliated and has a highly brilliant lustre; it occurs in a 
quartz porphyry and covers a considerable area; at the 
Blythe an enormous mass occurs in practically an 
inexhaustible quantity and very good quality; on the 
