118 



Case 87. 



Zincite. 



Frantlinite. 



Calamine. 



Goslarite. 



Willemite. 



Smitlisonite. 



Blende. 



ZINC. 



Oxide ; a pretty red mineral found in quantity at Franklin, 

 New Jersey. 461, with franklinite. 



Oxides of zinc, iron and manganese ; a black mineral found only 

 at Franklin, New Jersey, where it occurs in sufficient quantity to 

 constitute a valuable ore. The crystalline form is very charac- 

 teristic, and is well shown by the specimens exhibited: the faces 

 commonly seen are the cube and octahedron. 



Carbonate of zinc* A variety of encrusting forms, of 

 different colours, from Spain, Grreece, "Wisconsin Virginia, the 

 Northern Territory of South Australia, Mexico, &c. 



Hydrous sulphate of zinc ; a magnesia-bearing variety, found 

 in old mine workings at Callington, South Australia. 



Anhydrous silicate of zinc. 468, Franklin, New Jersey. 



Semimorphite, hydrous silicate of zinc ; Missouri, Hussia. 



Sulphide of zinc. 7544, Asturias, Spain ; transparent amber- 

 like variety. Weardale (England), Cumberland, Cornwall, 

 Derbyshire. The "Weardale specimens consist of small, lustrous, 

 black crystals, seated on or associated with fluor, chalybite, or 

 calcite. 



937, Przibram, Bohemia; variety containing cadmium. f 



Granular ores from Spain, Scandinavia, Russia. 

 3562, Kansas ; light-coloured crystalline variety. 



3459, Clear Creek County, Colorado, shows good crystal 

 faces. 



Joplln, Missouri, is a noted locality for blende. It is repre- 

 sented here by 7449, beautiful resinous crystals ; 3496, globular 

 form in dolomite ; 3497, Chewkite, Missouri ; beautiful little 

 ruby crystals. 



* Much confusion prevails in the nomenclature of some of the zinc minerals. For instance, 

 the carbonate of zinc, here termed calamine, is often called sniithsonite, and calamine 

 is applied to the hydrous zinc silicate. Here, as throughout this handbook, preference is 

 given to British usage. 



t Cadmium is not infrequently present in blende ; if in quantity, it may depreciate the 

 mineral as an oie of zinc. Its presence can only be determined by chemical methods. 



