66 



Case 65. Bathurst Co. — 9365, Parisli Malougulli, is yet another instance 



of andesite carrying copper ores. 



Wiseman's Creek. — The ore here occurs impregnating a talcose 

 schist. A fine block specimen will be found in the end compart- 

 ment of case 61. Labels, giving partial analyses, will be found 

 accompanying the sulphide ores. 



Molong. — 8182, carbonate ore from Grumble ; from a deposit 

 containing varying amounts of tinstone. 1774, Gowonglah, is 

 the only good specimen of the hair-like variety of red oxide of 

 copper (chalcotrichite) from this State in the collections. 



Bogan, Beemery, Gilgunnia, Mount Gipps, Silverton, 

 JS'untherungie, 



TIN. 



But few tin-bearing minerals occur in Nature, and of these only 

 two are at all common, viz., cassiterife or tinstone, the oxide of 

 tin, and stannite, a sulphide of tin, copper, and iron. The former 

 only is used as an ore of tin. 



Tinstone is a heavy mineral, generally blackish in colour, but 

 sometimes resinous and of a reddish tint or even creamy. The 

 crushed ore is more or less buff in colour (streak), no matter 

 how black the mineral itself may be. Tinstone is harder than 

 the best steel, so that it is quite impossible to scratch it with 

 a knife. The hardness, density, and streak are of great assist- 

 ance in identifying the mineral. The colour of the powder 

 alone should prevent the common error of confusing it with 

 titaniferous iron ore, which has a black streak. Otlier 

 minerals sometimes mistaken for tin ores, such as wolfi'am and 

 tourmaline, will be referred to later. Like gold, tinstone may be 

 mined either in its pare at rock, or in alluvial deposits arising fi'om 

 the destruction of the tin-bearing rock by denudation ; it is then 

 known as stream tin. Of these the alluvial deposits are by far the 

 richer, much of the rock, being lighter than the ore, having been 

 carried away by the running water. In every tin-mining district 



