最終更新日:2022/12/07
正解を見る
(mineralogy) A metallic ore, (Fe,Mn)(Ta,Nb)₂O₆, from which the elements niobium and tantalum are extracted.
編集履歴(0)
元となった辞書の項目
(mineralogy) A metallic ore, (Fe,Mn)(Ta,Nb)₂O₆, from which the elements niobium and tantalum are extracted.