Fluorbritholite-(Y)
Fluorbritholite-(Y) is an IMA-recognized mineral species in the silicate class, with the chemical formula (Y,Ca)₅(SiO₄)₃F.
It crystallizes in the hexagonal crystal system (space group P6_3/m). It is a member of the Apatite structural group.
Key properties: Mohs hardness 5.5; specific gravity 4.609; Pale brown to almost white streak; Vitreous to greasy; resinous [metamict] luster; optically uniaxial.
IMA symbol Fbri-Y, IMA status: approved, named in 2009.
Found in pegmatite cutting alkaline granite.
It is found associated with Y-bearing fluorite, allanite-(Ce), quartz, aluminocerite-(Ce), bastnäsite-(Ce), britholite-(Y), gadolinite-(Y), hundholmenite-(Y).
As the fluorine-dominant analogue of britholite-(Y).
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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