Mooihoekite
A copper-iron sulfide discovered in 1972 at South Africa's Mooihoek mine.
Intro adapted from Wikipedia (CC BY-SA).
Mooihoekite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Cu₉Fe₉S₁₆.
It crystallizes in the tetragonal crystal system (space group P-42m). It is a member of the Chalcopyrite structural group.
Key properties: specific gravity 4.36; Metallic. R: (400) 14.3, (420) 16.7, (440) 20.0, (460) 23.9, (480) 27.5, (500) 30.6, (520) 33.2, (540) 35.2 luster.
IMA symbol Mho, IMA status: approved, named in 1971.
Found in massive sulfide from a pipe-shaped dunite pegmatite in the Norite Zone of the Bushveld complex (Mooihoek mine, South Africa); in troctolite from the basal Duluth Gabbro complex (Minnesota, USA).
It is found associated with Haycockite, magnetite, troilite, cuprian pentlandite, mackinawite, sphalerite, moncheite (Mooihoek Farm, South Africa); haycockite, copper, troilite.
The name is derived from the locality on Mooihoek Farm, South Africa.