Waimirite-(Y)
Waimirite-(Y) is an IMA-recognized mineral species in the halide class, with the chemical formula YF₃.
It crystallizes in the orthorhombic crystal system (space group Pnma).
Key properties: Mohs hardness 5–6; specific gravity 5.586; White streak; Vitreous luster; optically biaxial.
IMA symbol Wai-Y, IMA status: approved, named in 2013.
Found in veins cutting A-type granite formed by reaction with fluorine and REE-rich fluids.
It is found associated with Biotite, albite, muscovite, microcline, columbite-(Fe), zircon, thorite, xenotime-(Y), samarskite-(Y), ilmenite, euxenite-(Y), fergusonite-(Y), rutile, illite.
The name refers to the Waimiri-Atroari people of Roraima and Amazonas, Brazil.
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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