Strictly speaking a metal/oxide is a commodity, it's a raw...

Strictly speaking a metal/oxide is a commodity, it's a raw material (that can't be improved, in contrast to a differentiated product).
However when the compound is not naturally occurring and takes significant expertise to separate and produce/refine into exacting purities. Especially when you consider the high tech applications demand this quality/purity to take advantage of the unique properties of these elements/compounds, I'd argue each of these separated rare earth elements and oxides should be considered a differentiated product.
(See product differentiation: https://www.investopedia.com/terms/p/product_differentiation.asp)

Then when you consider there's only 2 shops in town that sell a particular product, it can be regarded as more exclusive due to lack of supply/availability, which is why I don't think a spot price is relevant either. It's a niche market, they are not widely used or widely available. (unlike Iron Ore at ~58%-62%)
(See coercive monopoly: https://en.wikipedia.org/wiki/Coercive_monopoly)

These compounds are simply high-technology inputs. There's not a lot of use cases, but they have shown huge amounts of potential and strategic importance due to their unique properties. As a result they are still being researched and explored due to limited availability and quality.