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Formula: CaMg[(Ce7Y3)Ca5](SiO4)3(Si3B3O18)(AsO4)(BO3)F11
Nesosilicate, vicanite group,
cerium-, arsenic- and
boron- bearing mineral
Crystal System: Trigonal
Colour: Greenish-yellow
Environments
Arrheniusite-(Ce) is a relatively new mineral, approved in 2019 and to date (June 2022) reported only from the
type locality.
Localities
The type locality, the Östanmossa mine, Röberg ore field, Norberg, Västmanland County, Sweden, is a Bastnäs-type
rare earth element (REE) deposit enriched in heavy rare earth elements,
yttrium, magnesium, calcium and fluorine
(Mindat).
The occurrence is hosted in metasomatic skarns, formed by fluids rich in rare-earth-elements
and other metals that have reacted with carbonate layers in a volcano sedimentary pile. It is inferred that the
mineral-forming fluids were hot (initial temperature ≥ 400oC), saline (chlorine- and fluorine-
bearing), and predominantly of magmatic origin.
Arrheniusite-(Ce) was discovered in a hand specimen associated with
dolomite, tremolite,
talc, magnetite,
calcite, pyrite,
dollaseite-(Ce), parisite-(Ce),
bastnäsite-(Ce),
fluorbritholite-(Ce) and
gadolinite-(Nd). Minor amounts of other types of fluorocarbonates and an
unknown silicate mineral also occur. Among the rare-earth-element minerals present, mostly fluorocarbonates are
found adjacent to arrheniusite-(Ce)
(CM 59.177-189).
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