Haycockite

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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