199 



:: I-'. COBALT NITRATE. Co(NO s ) a . 

 t a. Crystallized. 



343. OXIDE. Co 2 0. (Monoxide of Cobalt, Cobaltous Oxide.) 



t a. Grey powder. 



344. SESQUIOXIDE. Co 3 s . (Cobaltic Oxide.) 



t a. Black powder. 



t b. Impure, mixed with sand. (Zaffre.) 

 Note. Specimen b consists of the ore mixed with sand, roasted, and 

 powdered. 



MANGANESE. Mn. 



345. METALLIC. 



t a. Small pellets. 



Note. This specimen was prepared by Professor Redwood. 



346. CARBONATE. MnCO s . 



a. Impure, a commercial specimen. 

 6. Pare, in powder. 



347. CHLORIDE. Mn C1 9 . (Manganous Chloride). 



a. Pink crystals. 



348. OXIDE. Mn 2 s . (Red Oxide of Manganese, Sesquioxide of 



Manganese.) 

 a. Powder. 



Note. This oxide occurs native in braonite and hydrated in man- 

 ganite, for specimens of which, see Case No. 8 in this Museum. 



349. PEROXIDE. Mn0 2 . (Black Oxide of Manganese, Dioxide of 



Manganese.) 

 a. Powder. 



Note. This oxide occurs native as pyrolusite, for a specimen of which, 

 see Case No. 8. 



350. PHOSPHATE. Mn 3 2P0 4 . 



a. Pale pink powder. 



351. SULPHATE. Mn S 4 . (Manganous Sulphate.) 



a. Pink crystals. 



PENTAD METALS. 



ANTIMONY, OR STIBIUM. Sb. 



352. METALLIC. 



a. Commercial specimen, 

 t b. Large crystalline cake. (French Regulus of Antimony.) 



353. CHLORIDE. Sb C1 3 . (Butter of Antimony, Trichloride of Anti- 



mony, Antimonous Chloride.) 

 a. White crystalline mass, pure. 

 6. Dark-red liquid, an impure solution. 



Xote. This liquid is prepared by decomposing native sulphide of anti- 

 mony by hydrochloric acid. It contains iron and other impurities. 



