Kolfanite
Kolfanite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ca₂Fe³⁺₃O₂(AsO₄)₃·2H₂O.
It crystallizes in the monoclinic crystal system. It is a member of the Arseniosiderite structural group.
Key properties: specific gravity 3.3; Adamantine luster; optically biaxial.
IMA symbol Kfn, IMA status: approved, named in 1981.
An alteration product of holtite in a hydrothermally altered granite pegmatite.
It is found associated with Mitridatite, arseniosiderite, laueite, apatite, montebrasite.
An abbreviation for the Russian KOL’skii Filial Akademii Nauk SSSR [Kola Branch of the Academy of Sciences of the USSR].
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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