General Information:
Chemical Formula:
AgFeS2
Composition:
(Molecular Weight = 227.85 gm)
Iron 24.51 % Fe
Silver 47.34 % Ag
Sulfur 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
More details...