Fluorotetraferriphlogopite
Fluorotetraferriphlogopite is an IMA-recognized mineral species in the silicate class, with the chemical formula KMg₃Fe³⁺Si₃O₁₀F₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Mica structural group.
Key properties: Mohs hardness 3–4; specific gravity 2.966; Pale brown streak; Pearly luster; optically biaxial.
IMA symbol Ftfphl, IMA status: approved, named in 2010.
Found in metamorphosed carbonate rocks in association with a large REE-Fe-Nb deposit.
It is found associated with Fluorbritholite-(Ce), norbergite, richterite, serpentine.
The prefix, fluoro, identifies the F-analog of tetraferriphlogopite.
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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