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Minerals Hub / Oxides / Yttrium oxide

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Illustrative artwork: a piece of transparent yttrium oxide ceramic. Not a facility, equipment or material connected to this project. · Illustration · Osmond Hub
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Yttrium oxide

Y₂O₃ · heavy rare earth

Yttrium is the only one of the five with no Osmond grade of any kind — explicitly excluded from the 19.4% TREO figure and absent from the MREO definition — and the only one that is not a lanthanide and not a magnet metal.

Yttrium oxide is classed as a heavy rare earth oxide, but yttrium is not a lanthanide. It sits in the row above the lanthanides and has no 4f electrons at all, and it is grouped with the heavies because its ionic radius falls among theirs — so it tracks them through solvent extraction and reports with them through processing. That is general chemistry. The oxide itself is a simple sesquioxide, very stable and very refractory.

The difference that matters commercially is that yttrium is not a magnet metal. In general terms its uses sit in phosphors, ceramics and refractories: as a host and matrix in display and lighting phosphors, in yttrium aluminium garnet for lasers and LED components, as yttria-stabilised zirconia in thermal barrier coatings, oxygen sensors and solid-oxide fuel cell electrolytes, and in crucibles and high-temperature refractories. None of that is driven by electric-vehicle traction motors or wind-turbine generators. Yttrium demand therefore moves with ceramics, coatings, lighting and display cycles rather than with the magnet story that carries the other four oxides on this hub — and that independence is the whole of its distinctiveness here.

On Osmond's reported data, this page is deliberately short, because the record is. The 19.4% TREO figure from the 3 March 2026 preliminary metallurgical testwork explicitly excludes yttrium. MREO is defined in that release as neodymium, praseodymium, dysprosium and terbium, which does not include yttrium either. Osmond has therefore published no yttrium grade at all — not an itemised one and not a grouped one. The 19 February 2026 release estimated xenotime, the accessory mineral that commonly hosts yttrium, at 0.03–0.04% and reported it as negligible in the drill holes, but that is a mineralogical estimate calculated by mass balance from oxide assays, not a yttrium grade. Nothing in the published record supports any statement about yttrium content in Orión material.

Heavy rare earth supply is concentrated, and EU import reliance on rare earths is approximately 100%.