198 



275. GOLD STANNATE. 



t a. Dark-purple powder. (Purple of C 



Note. The composition of this substance is not exactly known. 



TETRAD METALS. 



PLATINUM. Pt. 



276. METALLIC. 



t a. Native, in small grains. 



t 6. In foil and wire. 



t c. In greyish spongy lumps, reduced from the ammonio- 



chloride. (Spongy Platinum.) 

 t d. Intensely black powder, very finely divided by chemical 



means. (Platinum Black.) 



277. CHLORIDE, PLATINIC. PtCl v 



t a. Deliquescent yellowish-brown granules. 



278. AMMONtO-CHLORIDE. 2 N H 4 Cl Pt Cl v 



t a. Yellow crystalline powder. 



PALLADIUM. Pd. 



279. METALLIC. 



t a. In foil and wire. 



t 6. In dark-grey powder. (Palladium Sponge.) 



280. OXIDE. Pd 0. 



t a. Black powder. (Palladous Oxide, Monoxide of Palla- 

 dium.) 



RHODIUM. Rh. 



281. METALLIC. 



t a. In silvery porous lumps. (Rhodium Sponge). 



IRIDIUM. Ir. 



282. METALLIC. 



f a. Small grey pieces without metallic lustre. (Iridium 

 Sponge.) 



283. IRIDIC OXIDE. Ir0 3 . (Dioxide of Iridium.) 



t a. Bluish-black powder. 



OSMIUM. Os. 



284. METALLIC. 



t a. Dark-grey granular powder. (Osmium Sponge.) 



TIN. Sn. 



285. METALLIC. 



a. Grained tin. 



b. Granulated tin. 



c. Tinfoil. 



