Yttriaite-(Y) is an exceedingly rare mineral, a natural form of yttrium oxide, Y2O3.Mills, S.J., Kartashov, P.M., Ma, C., Rossman, G.R., Novgorodova, M.I., Kampf, A.R., and Raudsepp, M., 2011: Yttriaite-(Y): The natural occurrence of Y2O3 from the Bol’shaya Pol’ya River, Subpolar Urals, Russia. American Mineralogist 96(7), 1166–1170 In terms of chemistry it is yttrium-analogue of kangite, arsenolite, avicennite and senarmontite (isometric minerals).Mindat, Kangite, http://www.mindat.org/min-42879.htmlMindat, Arsenolite, http://www.mindat.org/min-294.htmlMindat, Avicennite, http://www.mindat.org/min-437.htmlMindat, Senarmontite, http://www.mindat.org/min-3618.html Other minerals with the general formula A2O3 include corundum, bismite, bixbyite, eskolaite, hematite, karelianite, sphaerobismoite, tistarite, and valentinite.Mindat, Tistarite, http://www.mindat.org/min-38695.html Yttriaite-(Y) forms tiny inclusions in native tungsten.
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