(comparative more niobiferous, superlative most niobiferous)
niobium + -iferous
"niobiferous." YourDictionary, n.d. Web. 06 December 2018. <https://www.yourdictionary.com/niobiferous>.
niobiferous. (n.d.). Retrieved December 06th, 2018, from https://www.yourdictionary.com/niobiferous
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