Yttrotungstite-(Y)
Yttrotungstite-(Y) is an IMA-recognized mineral species in the silicate class, with the chemical formula Y(W,Fe,Si,Al,Ti)₂(O,OH,H₂O)₉.
It crystallizes in the monoclinic crystal system (space group P2_1/m).
Key properties: specific gravity 5.96; optically biaxial.
IMA symbol Ytgs-Y, IMA status: approved, named in 1927.
Found in eluvial cassiterite mines, probably altered from wolframite or scheelite.
It is found associated with Kaolinite, quartz, muscovite, hydrobiotite, hematite, cassiterite, tourmaline, scheelite, rutile, stolzite, raspite, plagioclase, gypsum.
The name refers to YTTRium and TUNGSTen 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.
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