Arrheniusite-(Ce)

arrheniusite-(Ce)

dollaseite-(Ce)

parisite-(Ce)

bastnasite-(Ce)

Images

Formula: CaMg[(Ce7Y3)Ca5](SiO4)3(Si3B3O18)(AsO4)(BO3)F11
Nesosilicate, vicanite group, cerium-, arsenic- and boron- bearing mineral
Colour: Greenish-yellow
Environments

Metamorphic environments

Arrheniusite-(Ce) is a relatively new mineral, approved in 2019 and to date (June 2022) reported only from the type locality.

Localities

At the type locality, the Östanmossa mine, Röberg ore field, Norberg, Västmanland County, Sweden, 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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