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Silicate

Arrheniusite-(Ce)

CaMg[(Ce₇Y₃)Ca₅](SiO₄)₃(Si₃B₃O₁₈)(AsO₄)(BO₃)F₁₁
Hardness5
Crystal systemHexagonal
ClassSilicate
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Arrheniusite-(Ce)

Arrheniusite-(Ce) is an IMA-recognized mineral species in the silicate class, with the chemical formula CaMg[(Ce₇Y₃)Ca₅](SiO₄)₃(Si₃B₃O₁₈)(AsO₄)(BO₃)F₁₁.

It crystallizes in the hexagonal crystal system (space group R3m). It is a member of the Okanoganite structural group.

Key properties: Mohs hardness 5; specific gravity 4.78; Vitreous luster; optically uniaxial.

IMA symbol Arr-Ce, IMA status: approved, named in 2020.

Found in a Bastnäs-type, rare-earth element (REE) deposit in a metasomatic F-rich skarn.

It is found associated with Dolomite, tremolite, talc, magnetite, calcite, pyrite, dollaseite-(Ce), parisite-(Ce), bastnäsite-(Ce), fluorbritholite-(Ce), gadolinite-(Nd).

The mineral was named to honor Carl Axel Arrhenius (1757-1824), a Swedish officer and chemist, who discovered the first REE-bearing mineral, later named gadolinite-(Y).

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more A minerals or help write this entry.