26 



Case 50. specimens, and the crushing ores, in the order {[mentioned. 

 c t 11" d "^^^^ ^®^^ specimens of crystallised gold are generally secured by 

 gold. private persons, and the Mining Museum possesses but few. 



Native gold crystallises in the cubic system. 2681 consists of 

 the form known as the rlwinhic dodecaJiedrooi, in which there are 

 twelve rhombic faces. The crystal on the centre support shows 

 this best. 



Crystal of Gold (rhomhic dodecaJicdron) 



Of the other specimens, 5638, from Grong Grong, is the only 

 one that shows definite outline. The crystals are extremely 

 small, but w'ith a powerful glass triangular faces are readily 

 seen. The form is that of the octaJiedron. 



8564 and 2652, Ti Tree, Oakey Creek, Manilla: Here the 

 gold is contained in calcite, and is obtained in a spongy mass 

 when the latter is dissolved in acid.* The spongy mass of gold, 

 enclosed in a glass-capped bos for security, really belongs to the 

 specimen immediately preceding it. 



A few others are placed here for convenience : 



9037, Prince of "Wales Mine, Gundagai : shows a speck of 

 gold associated with telluride ox bismuth. 2677, Bowling A-lley 

 Point, jSTundle. 5524, Little Snowball Creek, Braidwood district. 

 4828, Bingera. 



Alhivial gold. These specimens, consisting almost entirely of miners' " pros- 

 pects," obtained by panning one or more dishes of wash-dirt, call 

 for no remark. Visitors from Ireland will note that !N"ature has 

 produced a very good representation of the Harp of Erin. 



* Among- the exhibits from the Wentworth Mine in case 52 mil be found a specimen of 

 P3'rites from which the gold has been similarly liberated. 



