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Silicate

Iimoriite-(Y)

Y₂(SiO₄)(CO₃)
Hardness5.5–6
Crystal systemTriclinic
ClassSilicate
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Iimoriite-(Y) specimen

Iimoriite-(Y) Locality: Trimouns Talc Mine, Luzenac , Ariège , Midi-Pyrénées , France ( Locality at mindat.org ) This is the best specimen let go from the collection, and features an exquisite 6 x 4 mm iimoriite crystal whose termination is freestanding! SUPERB for the species and locality! 3.2 x 2.5 x 1.25 cm — Photo: Robert M. Lavinsky · CC BY-SA 3.0

Iimoriite-(Y)

Iimoriite-(Y) is an IMA-recognized mineral species in the silicate class, with the chemical formula Y₂(SiO₄)(CO₃).

It crystallizes in the triclinic crystal system (space group P-1).

Key properties: Mohs hardness 5.5–6; specific gravity 4.47; White streak; Vitreous to resinous luster; optically biaxial.

IMA symbol Iim-Y, IMA status: approved, named in 1967.

Found in quartz-microcline pegmatite (Fusamata, Japan); in veins in peralkalic riebeckite-aegirine granite (Bokan Mountain, Alaska, USA).

It is found associated with Biotite, monazite, fergusonite, uraninite, thalenite (Fusamata, Japan); quartz, albite, siderite, pyrite, fluorite, sphalerite, galena, zircon (Bokan Mountain.

The name refers to Takeo Iimori and Satoyasu Iimori (1885{?), Japanese mineralogists, and yttrium in the composition.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more I minerals or help write this entry.