
SILVER. 119 
Dyscrasite, or Antimonial Silver, consists simply of silver and anti- 
mony (78 parts to 22=Ag, Sb), and has nearly a tin-white color. 
G.=9'4-9°8. B.B. fumes of antimony pass off, leaving finally a 
globule of silver. From Wolfach, Wittichen, Andreasberg ; also 
' Allemont in Dauphiny ; and Bolivia, S. A. 
Pyrargyrite.—Ruby Silver. Dark Red Silver Ore. 
mhombpohedral.. ..RAR-= 108° 42; ARAi-2 = 129°: 39". 
Cleavage parallel to R imperfect. Also massive. Black to 
dark cochineal-red, with the streak cochi- 
neal-red and lustre splendent metallic-ada- 
mamemes; Fl: = 2-2: G.i=5:7-5:°9. 
Composition. Ag,S,Sb (=38 Ag, S+8b, 
S,)=Sulphur 17°7, antimony 22-5, silver 
59°8=100. 
__B.B. fuses very easily; on charcoal a 
white deposit of antimony oxide is deposited, 
and with soda a globule of silver is obtained. In an open 
_ tube gives off sulphurous fumes that redden litmus paper. 
Diff. lis red streak, and its reactions for antimony and 
silver, are distinctive. 
Oos. Occurs at Andreasberg ; also in Saxony, Hungary, 
Cornwall, Mexico, Chili; in Nevada at Washoe; abundant 
about Austin, Reese River; at Poor Man’s Lode, Idaho. 
Proustite, or Light Red Silver Ore, is a related ore con- 
taining arsenic in place of much or all of the antimony. 
Composition, Ag, S,As=Sulphur 19:4, arsenic 15:1, silver 
65°0=100. G.=5:4-5°56. | 
B.B. gives a garlic odor. 
Occurs with pyrargyrite at the above-mentioned localities. 

Stephanite.—Brittle Silver Ore. Black Silver. 
Trimetric. J,2—115° 39’. No perfect cleavage. Often 
in compound crystals. Also massive. Streak and color 
iron-black. H.=2-2°5. G.=—6°27. 
Composition. Ag.S,Sb (=5 Ag,S+8b, 8,) = Sulphur 
16°2, antimony 15°3, silver 68°5. B.B. it gives an odor of 
sulphur and also fumes of antimony, and yields a dark 
metallic globule, from which silver may be obtained by the 
addition of soda. Soluble in dilute nitric acid, and the solu- 
tion indicates the presence of silver by silvering a plate of 
copper. 
