General Information:
Chemical Formula:
(Cu,Fe)4S4
Composition:
(Molecular Weight = 367.05 gm)
Iron 30.43 % Fe
Copper 34.63 % Cu
Sulfur 34.94 % S
Empirical Formula:
Cu2Fe2+2S4
IMA Status:
Approved IMA 1979
Locality:
Undu mine, Nukundamu, Fiji.
Name Origin:
Named for the locality.
Physical Properties:
Cleavage:
[0001] Perfect
Color:
copper red.
Density:
4.3
Diaphaniety:
Opaque
Habits:
Microscopic Crystals - Crystals visible only with microscopes., Hexagonal - Six-sided crystal shape in cross-section or habit., Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
3.5 - Copper Penny
Luster:
Metallic
Streak:
dark gray
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