PHYSIOGRAPHY* 



Pyromorphite. 



color. In the interior flame, the globule becomes bluish, is luminous 

 when hot, and on cooling crystallizes with large facets of a lighter color, 

 approaching the mother of pearl. The form produced by this crystalli- 

 zation has not been accurately examined, though it appears to be a reg- 

 ular composition ofseveral individuals. With borax, salt of phosphorus 

 and soda, it behaves like the oxide of lead. With boracic acid and iron, 

 it affords phosphate of iron and metallic lead. 



3. Analysis. 



By KLAPROTH. By WOHLER. 



from Zschopau, Saxony. 



Oxide of lead - 78-58 - - 78-40 - 82-287 



Phosphoric acid - 19-73 - - 18-37 - 15-727 



Muriatic acid - 1-65 - - 1-70 - 1-986 



Oxide of iron 000 - - 0-10 - a trace. 



By KERSTEN. 



Chloride Fluor- Phos. Phos. Oxide 



Locality. Sp. gr. of ide cal- of of of Total. 



Lead. cicum. lime. lead. iron. 



Sonnenwirbel - 6 092 - 10-838 - 1-094 - 11-053 - 77-015 - 0-00 - 100-000 



Mies(mas've) - 6-444 - 10 642 - 0-248 - 7-457 - 81-451 - trace - 99-998 



do. (crystals) - 5-983 - 9-664 - 0-219 - 0-848 - 89-268 - 0-00 - 99-999 



Bleisdadt (do.)- 7-009- 9-918-0-137- 0-771 - 89-174 - 0-00 - 100-000 



England (do.) - 0-000 - 10-074 - 0-130 - 0-682 - 89-110 - 0-00 - 99-896 



Poullaouen(do-) - 7-048 - 10-090 - 0-000 - 0-000 - 89-910 - trace - 100-000 



do. (mas've) - 7-050 - 10-069 - 0-000 - 0-000 - 89-931 - trace- 100-000 



4. It is found in veins in various rocks, usually attended by Galena, 

 various salts of lead, Blende, Fluor and Quartz ; sometimes also by dif- 

 ferent ores of silver. 



Finely crystallized varieties are found at Zschopau, and other places 

 in Saxony ; at Przibram and Mies in Bohemia ; in various parts of Eng- 

 land, and at the lead hills of Scotland ; also in Siberia. The brown va- 

 rieties occur at Poullaouen and Huelgoet in Brittany, at Wanlockhead 

 in Scotland, at Mies and Bleistadt in Bohemia. 



In the United States, handsome specimens of the green varieties, have 

 been found at the Perkiomen lead mine near Philadelphia, and at the 

 lead mine in Lenox, (Maine.) 



PYROPE. (See Garnet.} 



