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Formula: CoSbAs
Arsenide,
lollingite group,
cobalt- and antimony-
bearing mineral
Crystal System: Orthorhombic
Specific gravity: 7.91 calculated
Hardness: 5 to 5½
Streak: Grey
Colour: Silver-white
Environments
Localities
At the type locality, the Tunaberg Cu-Co Ore Field, Tunaberg, Nyköping, Södermanland County, Sweden,
oenite was found in polished sections of arsenide- and
antimonide- rich
chalcopyrite - bornite
- galena associations collected from the dumps at the abandoned mine
in copper-cobalt sulphide
skarn.
Oenite forms anhedral, polycrystalline aggregates up to 300 microns across in
chalcopyrite, usually along contacts with
cobaltite. Gudmundite
in chalcopyrite is separated from
cobaltite by an oenite-rich zone.
Cobaltite is replaced by
chalcopyrite and oenite. In
magnetite-bearing
chalcopyrite - galena
samples, a 10-60 micron wide rimming aggregate of oenite grains occurs as a replacement of
löllingite enclosed in
chalcopyrite, whereas
löllingite enclosed in
galena is replaced by iron- and
nickel- rich oenite and unnamed (Fe,Ni,Co)SbAs. Oenite
may contain inclusions of native bismuth,
dyscrasite or
allargentum,
breithauptite,
chalcopyrite and idiomorphic
sphalerite; the mineral is rimmed by
native bismuth, dyscrasite
or allargentum,
breithauptite, nisbite
and tetrahedrite. Other minerals identified in
oenite-bearing specimens are acanthite,
antimony, arsenopyrite,
cobaltpentlandite,
(para)costibite, cubanite,
kieftite, mackinawite,
pyrrhotite,
stannoidite and
uraninite
(CM 36.855-860).
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