Haycockite
Haycockite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Cu₄Fe₅S₈.
It crystallizes in the orthorhombic crystal system (space group P222). It is a member of the Chalcopyrite structural group.
Key properties: specific gravity 4.33.
IMA symbol Hyc, IMA status: approved, named in 1971.
Found in a hortonolite dunite (replacement) pegmatite in the Bushveld complex (Mooihoek mine, South Africa).
It is found associated with Mooihoekite, copper, troilite, pentlandite, cubanite, magnetite (Minnesota, USA).
The mineral was named to honor Maurice Hall Haycock (1900–?), former Head, Mineralogy Section, Mineral Sciences Division, Department of Energy, Mines, and Resources, Mines Branch, Ottawa, Canada.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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