252 NATIVE GLASS OF LEAD. 

 tween the beds of sandstone, occasionally 

 assuming crystalline and beautiful dendritic 

 forms. These mines have been worked by 

 the Indians from time immemorial, and 

 were found in operation at the period of the 

 Spanish conquest. Since then, up to the 

 present date, the}' have gradually increased 

 in importance, {David Forhes.) 



Analysis of pseudomorphous crystals of 

 Native Copper from the Veta Umacoia 

 (main seam), in the Socabon de la Paz in 

 Bolivia, by 31. Kroeher : 



Copper .... 98-605 

 vSilica ..... 0-015 

 Silver ..... trace 

 Iron (as lost) . . . 1-376 

 Metallic matter (insoluble in 

 nitric acid) . . . 0-004 



100-000 



Native Glass of Lead, Kirwan. 

 Massive White -lead ore. 



Native Gold. See Gold. 



Native Hydrate of Magnesia. See 

 Brucite. 



Native Iridium. See Iridosmine and 

 Platiniridiuim. 



Native Iron. Cubical: cleavage octa- 

 hedral. Colour steel-grey. Lustre metal- 

 lic. Opaque. Streak shining. Ductile and 

 malleable. Fracture hackly. Acts strongl^y 

 on the magnetic needle. H. 4-5. S-G. 7-3 to 7-8. 



BB fuses with great difficulty. 



Readily soluble in muriatic acid. 



Localities. — Irish. In minute particles in 

 the green basalt of Slieve Mish and in most 

 of the basaltic rocks of Antrim. — Foreign. 

 The mountain of Gravenoire in Auvergne, in 

 lava. Thuringia, in the argillaceous Keuper 

 Sandstone of MiAllhauseu. Hachenburg. 



Brit. Mus., Case 1. 



M.P.G. Principal Floor, Wall-case 18 

 (Siberia). 



The iron found in the Planer of Chotzen 

 in Bohemia in driving a railway tunnel 

 through a hill 120 feet below the surface, 

 is considered by Naumann to be a Meteoric 

 Iron which had fallen to the surface during 

 the cretaceous period, and to be in every 

 ■ivay similar to iron which has frequently 

 fallen in modern times. 



Pure Native Iron exists abundantly in 

 the country back from the central part of 

 the colony of Siberia. Early travellers state 

 that the natives of Africa find iron ore so pure, 

 that they heat and hammer it into form. 



The analysis of Dr. Hayes shows the com- 

 position of this iron to be : 



NATIVE PLATINUM. 

 Pure iron .... 98*40 

 Quartz, magnetic oxide of 

 iron and silicate of lime . 1*60 



100-00 



Native Iron may be distinguished from 

 manufactured iron by not containing car- 'I 

 bon ; and it is stated by Dr. Hayes and Pro- 

 fessor Rogers, that the presence of carbon in 

 iron is the best test of its having been arti- 

 ficiall}' brought to the metallic state. See 

 Meteoric Iron. 



Native Lead, Cubical. Occurs in small , 

 globules. Colour lead -grey. Lustre metallic, i 

 Malleable and ductile. H. 1-5. S.G. 11-445. ' 



Comp. Pure lead, or Pb. 



BB fuses readih% covering the charcoal 

 with a yellow oxide. 



Localities. Madeira in lava. The mines 

 near Carthagena in Spain. Guanaxuato in 'j 

 Mexico. -j 



Brit. Mus,, Case 1. 



Native Magnesia, Bruce. See Brucite. 



Native Magnet. See Lodestone and ' 

 Magnetite. J 



Native Mercury, Phillips. See Na- | 

 TiVE Quicksilver. 



Native Minium, Phillips. See Minium. 



Native Muriate of Iron, Jameson. 

 See Pyrosmalite. 



Native Palladium. Cubical ; primary 

 form the octahedron. Occurs in grains, : 

 sometimes composed of diverging fibres. 

 Colour steel -grey. Lustre metallic. Opaque. 

 Ductile ; very malleable. H, 4-5 to 5. S.G. 

 11-5 to 12-14. {Lowry.) 



Comp. Palladium or Pd, alloyed with a 

 little platinum and iridium, 



BB alone infusible, but on the addition 

 of sulphur fuses readily. 



Forms a red solution in nitric acid. 



Localities. With platinum ore in Brazil. ; 

 Tilkerode, with gold and selenide of lead. 

 Peru, forming ^ in the platinum ore. Za- 

 cotinga and Condonga in Brazil in auri- 

 ferous sand. Porpez in South America, 

 with a large quantity of gold and a small 

 quantity of silver in the ore called Ore 

 pudre. The Ural. 



Name. After the planet Pallas. 



Brit. Mus., Case 2. 



Native Platinum. Cubical. Usually ^ 

 occurs in grains or irregular masses. Colour ' 

 and streak pale steel-grey. Lustre metallic. 

 Opaque. Ductile and malleable. Fracture 

 hackly. H. 4 to 4-5. S.G, 16 to 19. 



Comp. Platinum or Pt, with iron, iridium, 

 rhodium and other metals. 



