Alnaperbøeite-(Ce)
Alnaperbøeite-(Ce) is an IMA-recognized mineral species in the silicate class, with the chemical formula (CaCe₂.₅Na₀.₅)(Al₄)(Si₂O₇)(SiO₄)₃O(OH)₂.
It crystallizes in the monoclinic crystal system (space group P2_1/m). It is a member of the Gatelite structural group.
Key properties: Mohs hardness 6–7; specific gravity 4.308; White streak; Vitreous luster; optically biaxial.
IMA symbol Apbø-Ce, IMA status: approved, named in 2012.
A late primary phase in REE-bearing quartz-microcline pegmatite.
It is found associated with Yttrian fluorite, törnebohmite-(Ce), allanite-(Ce), bastnäsite-(Ce).
Emphasizes the chemical relationships with perbøeite-(Ce).
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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