112 METALS. 



7. In'dium. — A white malleable metal discovered in zinc- 

 blende. It has a specific gravity of about 7.36, and is 

 easily fusible. 



TIN CLASS. 



1. Tin. — A metal of a silver-white color, very ductile and 

 malleable. There are only two ores of tin, — the j:>eroxide, 

 which is tin-stone or capiterite, and fin j'^rilcs, which is 

 sulphuret of tin or stannine. 



2. Tita'nium. — A metal of an orange-red color. It occurs 

 in different states of oxidation. The minute copper-colored 

 crystals sometimes found in the slag of the iron-smelting 

 furnaces are pure titanium. 



3. Nio'bium. — A rare metal discovered in the mineral tan- 

 talite. It is obtained in the form of a black powder, by 

 reducing the double fluoride of niobium and potassium 

 with sodium. 



4. Tan'talum. — The metallic base of the mineral tantalite. 

 It is of a grayish color, and but little acted on by the 

 ordinary acids. 



TUNGSTEN CLASS. 



1. Molybde'imm. — A metal which has been obtained only 

 in small, separate globules, in a blackish, brilliant mass. 

 These are brittle and extremely infusible. 



2. Vana'dium. — A metal found in the iron ore of Taberg, 

 in Sweden, and in lead ore from Wanlockhead, in Scotland. 

 It is white, with a metallic lustre, brittle, and diificult to 

 be reduced. It is not oxidized by air or water. 



3. Tung^'sten. — A white, hard, and brittle metal, very diffi- 

 cult of fusion. It is obtained chiefly from wol/ram, or 

 tungstate of iron and manganese. 



AKSENIC CLASS. 



1. Ar'senic. — A metal of a steel-gray color, brilliant lustre, 

 and quite brittle. It forms alloys with most of the metals. 

 Combined with sulphur, it forms orpinicnt and realgar, 

 which are the yellow and red sulphurets of arsenic. 



2. Antimony. — A metal of a bluish white color. It is so 

 brittle that it is easily reduced to powder. Its principal 

 ore is the sulphuret, known in commerce as crude diiti- 

 mojit/, and the metal is obtained by fusing the sulphuret 



