最終更新日：2024/07/29
(mineralogy) A black mineral that is a mixed iron and manganese niobate and tantalate, and is the main ore of niobium and tantalum.
正解を見る
columbite
編集履歴（0）
(mineralogy) A black mineral that is a mixed iron and manganese niobate and tantalate, and is the main ore of niobium and tantalum.
columbite
DiQt（ディクト）
無料
★★★★★★★★★★
