General Information:
Chemical Formula:(Fe,Pb)4S8O
Composition:(Molecular Weight = 526.19 gm)Iron 40.33 %
FeLead 7.88 %
PbSulfur 48.75 %
S Oxygen 3.04 %
O Empirical Formula: Fe2+3.8Pb0.2S8O
Environment:In a carbonate-hosted deposit.
IMA Status:Approved IMA (Dana # Added)
Locality:La Mallieue lead-zinc deposit, Engis, about 40 km southwest of Liege, Belgium.
Name Origin:For Prof. Willy Viaene (1943-), Katholieke Universiteit Leuven, Belgium.
Physical Properties: Cleavage:[110] Good
Color:yellow.
Density:3.7 - 3.9, Average = 3.8
Diaphaniety:Opaque
Habits:Aggregates - Made of numerous individual crystals or clusters., Spherical - Spherical, rounded aggregates.,
Hardness:3.5-4.5
Luster:Metallic
Streak:black
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