Outstanding green crystal aggregates of the very rare Ba-Fe phosphate mineral sigismundite from a Buranga pegmatite in Rwanda (Buranga Pegmatite, Gatumba, Ngororero District, Western Province, Rwanda), associated to pyrite and phosphosiderite. Sigismundite from Rwanda is green, not beige as in other localities. — Photo: David Hospital · CC BY 4.0
Sigismundite
Sigismundite is an IMA-recognized mineral species in the phosphate class, with the chemical formula BaFe²⁺(CaNa₂)Fe²⁺₁₃Al(PO₄)₁₁(PO₃OH)(OH)₂.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Arrojadite structural group.
IMA symbol Ajd-BaFe, IMA status: approved, named in 1994.
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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