Fluormayenite
Fluormayenite is an IMA-recognized mineral species in the halide class, with the chemical formula Ca₁₂Al₁₄O₃₂[ ₄F₂].
It crystallizes in the cubic crystal system (space group I-43d). It is a member of the Mayenite structural group.
Key properties: Mohs hardness 5.5–6; specific gravity 2.745; White streak; Vitreous luster.
IMA symbol Fmy, IMA status: approved, named in 2013.
Major constituent of larnite-bearing pyrometamorphic rocks.
It is found associated with Larnite, shulamitite, Cr-containing spinel-magnesioferrite series, ye’elimite, periclase, fluorapatite-fluorellestadite, brownmillerite, oldhamite.
Indicates the fluorine-dominant analog of mayenite.
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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