ON SOME NEW SOUTH WALES AND OTHER MINERALS. 239 



Silver — Native. 

 The native silver occurs scattered through (vein) quartz in 

 exceedingly thin and minute flakes looking more like mica than 

 silver. In one specimen the silver is associated with minute 

 garnets ; silver chloride, silver sulphide and lead carbonate are 

 are also associated with the native silver. From Silverton. 



Silver Chloride. 

 From the Broken Hill Proprietary Company's Mine. In cubes 

 about -iV' through, with the angles replaced by faces of the octo- 

 hedron ; these are accompanied by octohedra and combinations 

 of the octohedron and cube in which the faces of the former are 

 predominant or more largely developed. Twin crystals of the 

 octohedron are also found. Most of the crystals are very irregu- 

 larly developed and as usual the edges are generally rounded and 

 the faces slightly hollow or cavernous. 



The crystals are sometimes seated on a clay-like material, on 

 stalactitic black oxide of manganese, haematite, cerussite &c, and 

 diffused through white kaolin. 



Most of the specimens when fresh are pale shades of grey or 

 green, but they soon darken on exposure to light. 



One specimen from Broken Hill, in galena, shows the silver 

 chloride concentrated in the central parts of the mass of galena ; 

 Mr. Marsh points out that it probably represents a stage in the 

 formation of the slugs or nuggets of horn silver. Further con- 

 centration and the removal of the outer crust of galena would of 

 course leave a core of silver chloride. 



The crystals are sometimes scattered singly or in small groups, 

 and very often are arranged in branching and arborescent forms 

 and occasionally they can be separated from the matrix in irregular 

 layers looking like lace work. 



The largest crystals placed before you are about -jV in thickness, 

 but such large crystals are as usual very badly defined. 



In many cases the silver chloride looks more like a sublimate 

 than a crystallised deposit from solution. 



