Yttriaite-(Y)
| Yttriaite-(Y) | |
|---|---|
| General | |
| Category | Oxide minerals |
| Formula | Y2O3 |
| IMA symbol | Yt-Y |
| 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 | |
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.