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Formula: RhSbS
Sulphide, cobaltite group,
rhodium- and antimony- bearing
mineral
Crystal System: Isometric
Common impurities: Fe, Pt, Pd, Ir substituting for Rh
Environments
Plutonic igneous environments
Placer deposits
Andrieslombaardite is a new mineral, approved in 2022.
Localities
There are two co-type localities, the Joubdo Stream, Bir Bir River, Yubdo District, Gimbi, West Welega Zone,
Oromia Region, Ethiopia, and the Onverwacht Mine, Steelpoort, Fetakgomo Tubatse Local Municipality, Sekhukhune
District Municipality, Limpopo, South Africa.
At the the Joubdo Stream, Bir Bir River, Yubdo District, Gimbi, West Welega Zone, Oromia Region, Ethiopia,
(one of the co-type localities), in the samples, there are many grains of pale brownish gray
andrieslombaardite up to 25 x 55 μm in size, included in
platinum-iron alloys, some
associated with erlichmanite, and others attached to
bornite and chalcopyrite.
The platinum-iron alloys from
Yubdo containing platinum group mineral inclusions such as
andrieslombaardite were formed at some
post-magmatic stage owing to platinum group element remobilisation
during hydrothermal or metamorphic episodes
(South African Journal of Geology 126.2.151–160).
At the Driekop mine, Sekhukhuneland, Burgersfort, Fetakgomo Tubatse Local Municipality, Sekhukhune District
Municipality, Limpopo, South Africa, driekopite was found in a
concentrate from a zoned platinum pipe that crosscut the layered
mafic and ultramafic
sequences of the eastern Bushveld Complex. The holotype grain of
driekopite occurs in a complex, rounded aggregate in association with
isoferroplatinum,
hollingworthite,
geversite, insizwaite,
andrieslombaardite, stibiopalladinite,
sobolevskite, possible
tatyanaite, osmium-bearing
tulameenite and a
platinum-iron alloy.
(CJMP 61.537-547).
At the the Onverwacht Mine, Steelpoort, Fetakgomo Tubatse Local Municipality, Sekhukhune District Municipality,
Limpopo, South Africa (one of the co-type localities), andrieslombaardite is a single 8 x 20 μm grain
attached to laurite in a matrix of altered silicate and iron-oxyhydroxide
minerals.
The mineralisation of the intrusive dunite pipes was probably
introduced at high temperatures, under magmatic conditions.
The primary assemblages were to a certain degree overprinted
and redistributed by low-temperature hydrothermal fluids
(South African Journal of Geology 126.2.151–160).
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