General Information:
Chemical Formula:Ag4SeS
Composition:(Molecular Weight = 542.50 gm)Silver 79.53 %
AgSelenium 14.55 %
SeSulfur 5.91 %
S Empirical Formula: Ag4SeS
Environment:Low temperature silver mineral in deposits rich in selenium.
Locality:TL: Mexico, Guanajuato, San Carlos mine.
Name Origin:Named for Ponciano Aguilar (1853-1935), superintendent of the San Calos mine, Guanajuato, where the mineral was found.
Physical Properties: Cleavage:None
Color:gray, iron gray, or black.
Density:7.4 - 7.56, Average = 7.48
Diaphaniety:Opaque
Habits:Massive - Uniformly indistinguishable crystals forming large masses., ,
Hardness:2-3 - Gypsum-Calcite
Luminescence:Non-fluorescent.
Luster:Adamantine - Metallic
Streak:grayish black
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