Yttriaite-(Y)
Yttriaite-(Y) is an exceedingly rare mineral, a natural form of yttrium oxide, Y2O3. In terms of chemistry it is yttrium-analogue of kangite, arsenolite, avicennite and senarmontite (isometric minerals). Other minerals with the general formula A2O3 include corundum, bismite, bixbyite, eskolaite, hematite, karelianite, sphaerobismoite, tistarite, and valentinite. Yttriaite-(Y) forms tiny inclusions in native tungsten.
Intro adapted from Wikipedia (CC BY-SA).
Yttriaite-(Y) is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Y₂O₃.
It crystallizes in the cubic crystal system (space group Ia3). It is a member of the Bixbyite structural group.
Key properties: Mohs hardness 5.5; specific gravity 5.073; White streak; Adamantine to earthy (massive) luster.
IMA symbol Yt-Y, IMA status: approved, named in 2010.
Found in fluvial placer sediment derived from older inter-layered sandstones, alevrites and pebbly sands.
It is found associated with Copper, zircon, osmium, gold, pyrite, native tungsten with inclusions of quartz and “phengite”.
Based on the common name for the equivalent chemical compound, yttria.