General Information:
Chemical Formula:Cu4Fe5S8
Composition:(Molecular Weight = 789.95 gm)Iron 35.35 %
FeCopper 32.18 %
CuSulfur 32.47 %
S Empirical Formula: Cu4Fe2+5S8
IMA Status:Approved IMA 1972
Locality:Mooihoek Farm, Lydenburg, Transvaal, South Africa.
Name Origin:Named for Maurice H. Haycock (1900-), Canadian minerlaogist.
Physical Properties: Color:brass yellow or metallic.
Density:4.35
Diaphaniety:Opaque
Habits:Microscopic Crystals - Crystals visible only with microscopes., ,
Hardness:4.5 - Between Fluorite and Apatite
Luster:Metallic
Streak:black
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