General Information:
Chemical Formula:
Cu4Fe5S8
Composition:
(Molecular Weight = 789.95 gm)
Iron 35.35 % Fe
Copper 32.18 % Cu
Sulfur 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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