General Information:
Chemical Formula:
Ag4SeS
Composition:
(Molecular Weight = 542.50 gm)
Silver 79.53 % Ag
Selenium 14.55 % Se
Sulfur 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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