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noun:
- A supposed chemical element, later found to be a mixture of niobium and tantalum.
- A supposed factor claimed to possess been found by R.Harmann.
- A name distributed by Hermann to an element expected by him to be contained in the æschynite from the Ilmen mountains (when you look at the south Urals), additionally in yttrotantalite plus some relevant nutrients. Their conclusions have not been acknowledged by other chemists.
How would you define ilmenium?