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Silicate

Ulfanderssonite-(Ce)

(Ce₁₅Ca)Σ₁₆Mg₂(SiO₄)₁₀(SiO₃OH)(OH,F)₅Cl₃
Hardness5–6
Crystal systemMonoclinic
ClassSilicate
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Ulfanderssonite-(Ce)

Ulfanderssonite-(Ce) is an IMA-recognized mineral species in the silicate class, with the chemical formula (Ce₁₅Ca)Σ₁₆Mg₂(SiO₄)₁₀(SiO₃OH)(OH,F)₅Cl₃.

It crystallizes in the monoclinic crystal system (space group Cm).

Key properties: Mohs hardness 5–6; specific gravity 4.972; White streak; Vitreous to greasy luster; optically biaxial.

IMA symbol Ulf-Ce, IMA status: approved, named in 2017.

Found as a primary mineral in metasomatic Fe-REE skarn mineralization of the Bastnäs-type.

It is found associated with Västmanlandite-(Ce), bastnäsite-(Ce), phlogopite, talc, magnetite.

The mineral was named to honor Ulf B. Andersson (b. 1960), a Swedish geologist-petrologist for his contributions to the understanding of the genesis of REE deposits of the Bastnäs type.

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 U minerals or help write this entry.