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Yttriaite-(Y), ideally Y 2 O 3 , is a new mineral (IMA2010-039) from the alluvial deposits of the Bol’shaya Pol’ya River, Subpolar Urals, Russia. The new mineral occurs as isolated crystals, typically cubo-octahedra &lt;6 μm in size, embedded in massive native tungsten. Associated minerals include: copper, zircon, osmium, gold, and pyrite. The main forms observed are {100} and {111}. Due to the crystal size, physical properties could not be determined; however, the properties of synthetic Y 2 O 3  are well known. Synthetic Y 2 O 3  crystals are colorless to white with a white streak; crystals are transparent with an adamantine luster, while massive Y 2 O 3  is typically translucent with an earthy luster. Synthetic Y 2 O 3  has a Vickers hardness of 653.91, which corresponds to 5.5 on the Mohs scale. Synthetic Y 2 O 3  crystals have good cleavage on {111}. Yttriaite-(Y) is isotropic; the refractive index measured at 587 nm on synthetic Y 2 O 3  is n = 1.931. The empirical chemical formula (mean of 4 electron microprobe analyses) calculated on the basis of 3 O is: Y 1.98 Dy 0.01 Yb 0.01 O 3 . Yttriaite-(Y) is cubic, space group Ia3̅, with parameters a = 10.6018(7) Å, V = 1191.62(7) Å 3 , and Z = 16. The five strongest lines in the powder X-ray diffraction pattern (measured on synthetic Y 2 O 3  using synchrotron radiation) are [d obs  in Å (I) (hkl)]: 3.0646 (100) (222), 1.8746 (55) (440), 1.5984 (38) (622), 2.6537 (26) (400), and 4.3356 (14) (211). The mineral name is based on the common name for the chemical compound, yttria.

Yttriaite-(Y): The natural occurrence of Y 2 O 3 from the Bol’shaya Pol’ya River, Subpolar Urals, Russia