40 MINERALS OF TASMANIA. 
matter derived from the detrition of a lode which so far has not 
been discovered. In the same formation blocks of Galena and 
“slugs” of Silver Glance and argentiferous Pyrites also occur, the 
whole giving high assay returns of Silver. 
112. HALOTRICHITE (An Iron Alum). 
Found in fibrous silky masses of pale colour. 
West Coast (Technological Museum Collection, Melbourne). 
1138. IRON, METEORIC, (Jron, Nickel, Sc). 
A remarkably fine sample of this interesting substance weighing 
nearly 3 lbs. was obtained some years back at the Blue Tier, 
nerth-east coast ; it was found in stanniferous drift by a party of 
miners, and so excited their curiosity that they retained the 
specimen which is now in my collection. 
This Meteorite is coated with a semi-polished crust much darker 
in colour than its general outer surface, much of which is apparently 
worn by attrition and is then coloured by iron oxide. The surface 
generally contains numerous shallow cavities or pittings, the 
major portion of which contain a white dull substance showing 
grains of mica—this is probably granitic grit. The fractured 
surface discloses a very white metallic iron which is finely granulated 
with an indistinct striated structure, exactly as if it would clearly 
show the Widmannstetten figures if polished. As far as I am 
aware this is the only instance of a discovery of a meteorite that 
has occurred in this island. 
114. IDOCRASE (Silicate of Calcium and Alumina coloured 
mith Iron. 
Mount Ramsay. (J. Smith.) 
115. ILVAITE (Silicate of Iron and Calcium, colour black). 
St. Paul’s Plains. (Pro. Royal Soc. Tas., 1853.) 
116. IODYRITE (Lodide of Silver). 
This important and somewhat rare ore of Silver usually occurs 
of a pale yellow colour, and when in crystals they are of hexagonal 
form. It has been obtained in small quantity at the Washington 
Hay Silver Mine, Heazlewood. (C. F. Heathcote). 
117. IOLITE (Silicate of Alumina, Magnesia, and Iron). 
Of a pale blue colour from a vugh. 
Hampshire Silver Mine, Hampshire Hills. (W. R. Bell.) 
118. JAMIESONITE (Sulphantimonite of Lead). 
Occurs in somewhat large quantity at the Silver Cliff and the 
old Waratah mines at Mount Bischoff. At this locality its 
common mode of occurrence is filiform and amorphous, the 
