Yttriaite-(Y)

Yttriaite-(Y) is an exceedingly rare mineral, a natural form of yttrium oxide, Y₂O₃.^[3][2] In terms of chemistry it is yttrium-analogue of kangite, arsenolite, avicennite and senarmontite (isometric minerals).^[4][5][6][7] Other minerals with the general formula A₂O₃ include corundum, bismite, bixbyite, eskolaite, hematite, karelianite, sphaerobismoite, tistarite, and valentinite.^[8] Yttriaite-(Y) forms tiny inclusions in native tungsten.^[3]

Yttriaite-(Y)
General
Category	Oxide minerals
Formula (repeating unit)	Y2O3
IMA symbol	Yt-Y[1]
Crystal system	Isometric
Unit cell	a = 10.6018 Å; Z = 16
Identification
Color	White
Cleavage	Distinct – good
Fracture	Conchoidal
Mohs scale hardness	5–6
Luster	Adamantine
Streak	White
Specific gravity	5.073
Refractive index	n = 1.931
References	[2]

References

1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
2. Mindat
3. 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
4. Mindat, Kangite, http://www.mindat.org/min-42879.html
5. Mindat, Arsenolite, http://www.mindat.org/min-294.html
6. Mindat, Avicennite, http://www.mindat.org/min-437.html
7. Mindat, Senarmontite, http://www.mindat.org/min-3618.html
8. Mindat, Tistarite, http://www.mindat.org/min-38695.html