Jamesonite. 



Berthierite. 



82 



the mineral requires experience. Specimens are exhibited here 

 from Emmaville, Major's Creek, Molong, and Wiseman's Creek; 

 more will be found with the New England ores in silver case 58. 

 It also occurs at the Burragorang Silver Eield. 



Sulphide of lead and antimony. A mineral like antimonite in 

 appearance, but often possessing a feathery structure. Speci- 

 mens are exhibited from Hillgrove, Pye's Creek, and Cullen's 

 Creek (Eivertree). That from Pye's Creek (6966) shows the 

 jamiesonite forming at the expense of galena, which it is eating 

 into and encrusting. 



Sulphide of antimony and iron. A mineral resembling 

 jamesonite. Eivertree and Inverell. 



ZINC. 



Case 71- Zinc minerals, other than blende, are not common in JS'ew 



South "Wales : some, such as the oxide (zincite) and the silicates 

 (willemite) and (hemimorpliite) , have not yet been detected. 



Calamine. Carbonate of zinc* is found very sparingly at Broken Hill and 



Bredbo, but never in sufBcient quantity to admit of its being used 

 as an ore ot" zinc, as is the case in Spain and elsewhere (see case 

 87, page 11.2) . The mineral is colourless, or of various light shades 

 of green and blue. It is often found in small crystals resembling 

 the so-called dog-tooth spar (see calcite, case 101, page 156) ; 

 numerous instances of this will be found among the Broken Hill 

 specimens such as 948. At other times calamine occurs in crusts 

 or mammillated masses (4063). The specimens from Broken 

 Hill are very beautiful. They occur principally lining the interior 

 of cavities {vughs) above water-level. A common mode of occur- 

 rence is that in Avhicli stalactites of carbonate of lead or of oxides 

 of manganese and of iron are studded with little crystals standing 

 out at right angles to the length of the stalactite. Good 

 instances of this will be found in the collections (5513, 1865, 

 Plate Y). At Mount Stewart calamine has been found with 



* Great confusion exists in the naming of certain zinc ores — the English usage is to call 

 the carbonate calamine and the hydrous silicate smithsonite ; the Americans reverse this 

 order. 



