74 



The following deposits are represented in the sLow-case : — 

 Mittagong (spring deposits), County Camden, Illawarra, Count j 

 Argyle, Marulan, G-oulburn, Queanbeyan, Cudgegong, Fifield, 

 Tallewang, Carcoar, Mudgee, Cullerin, "Wallerawang, Newbridge, 

 Cadia, and the aluminous ores of Wingello and Inverell. Also 

 clay-band ore from Capertee. 



9281, Portion 101, Parish Muri'imba, County Camden : pure 

 bauxite, showing the characteristic concretionary structure. It 

 contains 61"-1G per cent, of alumina and less than 2 per cent, of iron. 



10130, 13135 : pisolitic aluminous iron ores from "Wingello and 

 Bungonia respectively ; these have been cut and polished to show 

 the characteristic structure. 



IRON (MINERALS). 



Case 69. ^^ ^^'^'^^ ^^^^ ^^® exhibited a few picked specimens of the charac- 

 teristic minerals composed of iron salts. It must be understood 

 that, either from, the quantity available being insufBcient, or 

 from some defect in quality, none of these minerals can be 

 at present regarded as representing deposits of iron ore. 



Magnetite. Magnetic oxide of iron, consisting of ferrous oxide and ferric 



oxide com.bined together ; a black heavy mineral, that cannot in 

 general be scratched with a knife blade, and is especially character- 

 ised by being more or less magnetic. AVhen crystallised it forms 

 ocialiedra or rhombic dodecaJiedra, but is very frequently massive. 



Crystal of magnetite (octahedron). 



9154, Little Snowball, Major's Creek : rhombic dodecahedral 

 crystals up to one-third of an inch in length of edge.* 



* For comparison the fine crystals of similar character from Chillagoe, jS'orth Queens- 

 land, ill case 126 may be referred to. 



