118 DESCRIPTIONS OF MINERALS. 



ores of silver, but is distinguished by being easily cut, like 

 lead, with a knife ; and also by affording a globule of silver 

 on charcoal, by heat alone. Its specific gravity is much 

 higher than that of any copper ores. 



Obs. This important ore of silver occurs in Europe prin- 

 cipally at Annaberg, Joachimstahl, and other mines of the 

 Erzgebirge ; at Schemnitz, and Kremnitz, in Hungary, and 

 at Freiberg in Saxony. It is a common ore at the Mexican 

 silver mines, and also in the mines of South America. It 

 occurs in Arizona, with chalcocite, at the Heintzelman Mine, 

 and in Nevada. 



Amass of "sulphuret of silver" is stated by Troost to 

 have been found in Sparta, Tennessee. 



Acaniliite is a trimetric sulphide of silver, Ag, S, from 

 Joachimstahl ; and Daleminzite, another, from near Frei- 

 berg. 



Stromeyeritc. A steel-grav sulphide of silver and copper, Ag„S 

 + Cu, S = Sulphur 15-7, silver 53'1, copper 81-2 = 100. G.= 6*26. 

 B.B. it fuses and gives in the open tube an odor of sulphur; but a 

 silver globule is not obtained except by cupellation with lead. From 

 Peru, Silesia, Chili, Siberia, and Arizona. 



SternbergUe. A sulphide of silver and iron containing 33 per cent. 

 of silver. It is a highly foliated ore resembling graphite, and like it 

 leaving a tracing on paper ; the thin lamina? are flexible ; color pinch- 

 beck brown ; streak black. From Joachimstahl and Johanngeorgen- 

 stadt. 



Xaumannite. A selenide of silver and lead in iron-black cubes and 

 massive ; G.=8 ; contains 73 per cent, of silver. From the Hartz. 



Hessite. A telluride of silver, Ag 2 Te = Tellurium 37*2, silver 62-8 = 

 100. Color between lead-gray and steel-gray. Sectile. G. =8 "3 — 8 '6. 

 B.B. in the open tube, faint sublimate of tellurous acid ; on char- 

 coal with soda a silver globule. From the Altai ; at Xagyag and 

 Retzbanya ; Coquimbo, Chili: Calaveras Co., Cal. ; Red Cloud Mine, 

 Colorado : Kearsarge Mine, Dry Canyon, Utah. 



Pctzite is a hessite with the silver replaced in part by gold. G. = 

 8"7-9 4 Between steel-grav and iron-black. Variety from Golden 

 Rule Mine, afforded Genth tellurium 32 68, silver 41 86, gold 25 60= 

 100 14. Occurs at the same localities with hessite. 



Tapalpite is a telluride of bismuth and silver from Mexico. 



Sylvatu'tc or Graphic Tellurium. A telluride of gold and silver 

 (Ag, An) Tes = iif Ag : Au=l : 1) Tellurium 55 8, gold 28 5, silver 157 

 = 100. Color and streak steel-gray to silver- white, and sometimes nearly 

 brass-yellow. H.=15-2. G. =7 99-8 33. Called graphic because of 

 a resemblance in the arrangement of the crystals to writing charac- 

 ters. From Transylvania : Calaveras Co., California ; Red Cloud and 

 Grand View Mines'. Colorado. 



Eucairite. A selenide of silver and copper, containing 42-45 per 

 cent, of silver ; color between silver- white and lead-gray ; easily cut 

 bv the knife. From Sweden and Chili. 



