PHYSIOGRAPHY. 73 



Native Palladium Native Platina. 



Hardness =4 5 . . . 5*0. Sp. gr. = 1 1 *8, WOLLASTON ; 

 = 13*14, LOWRY. 



1. It is reducible by heat. Alone, before the blow-pipe, it is infusi- 

 ble; but with sulphur, it melts. With nitric acid, it yields a red solu- 

 tion. 



It consists essentially of palladium, but contains also a small proportion 

 of iridium and platina. 

 | It occurs intermingled with Native Platina, in Brazil. 



NATIVE PLATINA. Platina Sclerone-Metal. 



Primary form. Cube. 



Irregular forms and grains. Surface uneven, sometimes 

 worn off by attrition, (pebbles.) 



Cleavage, none. 'Fracture hackly. 



Lustre metallic. Color perfect steel-grey. Streak un- 

 changed, shining. 



Ductile. Hardness - 4-0 . . . 4-5. Sp. gr. = 17-332, 

 rolled masses. 



1. It is very refractory, and soluble only in nitro-muriatic acid. 



2. Analysis. 

 By BERZELIUS. 



fr. Nifthne-Tagjiilsk. fr. Goroblagodat. fr. the Ural. . 



Platina 



Iridium 



Rhodium 



Palladium 



Iron 



Copper 



Osmium and iridium 



Earthy substances 



3. The original repositories of Native Platina are not known, it having 

 hitherto been found only in pebbles and grains, generally small, but 

 sometimes upwards of a pound and a half in weight. It is accompanied 

 by Zircon and some other gems; also by Magnetic Iron, Native Gold,< 

 and Native Iridium and Palladium. 

 VOL. II. ? 



