General Information:
Chemical Formula:AgFeS2
Composition:(Molecular Weight = 227.85 gm)Iron 24.51 %
FeSilver 47.34 %
AgSulfur 28.15 %
S Empirical Formula: AgFe3+S2
Environment:In goethite pseudomorphs after magnesian siderite.
IMA Status:Approved IMA
Locality:Silver-lead deposit in the Verkhoyano-Kolymskaya fold system, of the Lena River basin, Eastern Yakutia, Siberia, Russia.
Name Origin:Named after the Lena River.
Physical Properties: Cleavage:None
Color:gray.
Density:4.57
Diaphaniety:Opaque
Habits:Granular - Generally occurs as anhedral to subhedral crystals in matrix., Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.,
Hardness:4.5 - Between Fluorite and Apatite
Luminescence:Non-fluorescent.
Luster:Metallic
Streak:dark gray
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