54 



Case 60. Yass. — 1508, galeuaia fluor (the colourless mineral). 8247 



shows galena altering into cerussite, the latter mineral forming 

 concentric rings round the former. 



5826, Belconon (Murrumbidgee) : A galena ore carrying a very 

 little silver is exhibited because the matrix is felsitic. 



Grevfell. — Great Southern Mine. 7329 contains phosphate 

 of lead, to which the yellow colour of the specimen is due. 

 8248, massive carbonate of lead, appears from its structure to . 

 have resulted from the regular alteration of galena. 



Wallah Wallah, Rye Park. — See also pyromorphite specimen 

 8578, in case 62. 



'Burragorang. — This silver field is nearer to Sj'dney than any 

 other. The lodes occur in a mass of porphyry outcropping in 

 the valley, beneath a mountain of Permo-carboniferous and 

 Triassic strata. The ore consists of galena Avith arsenical 

 pyrites, chalybite, &c. 



9654, in case 128, is a section across the lode at the Terran- 

 derie mine ; it shows the parallel arrangements of the mineral 

 constituents extremely well. 



9304 shows native silver on galena. 



10021, the Peaks Mine : native silver on galena with mispickel 

 and copper pyrites. The galena assays 170 oz. of silver to the ton. 



10148, the Peaks Mine : pyrargyrite. 



10205, Terranderie Mine : a magnificent specimen of leafy 

 native silver. 



Case 62. ^^^^• 



No mining for lead alone is carried on in this State, the whole I 

 of the output being from the silver mines. The true lead ores 

 will therefore be found under the heading " Silver." In this case 

 are exhibited a number of well-crystallised lead minerals. The 

 variety of colouring and appearance and the great beauty of 

 some of these minerals are very striking. Other lead minerals 

 such as the magnificent red chromate, not known to occur in 



