A metallic element, occurring in columbite and other minerals. Symbol Cb. Now called niobium.
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| 释义 | the world > matter > chemistry > elements and compounds > metals > specific elements > niobium > [noun] (2) columbium1801 A metallic element, occurring in columbite and other minerals. Symbol Cb. Now called niobium. niobium1845 A soft, greyish-white chemical element, atomic number 41, which is one of the transition metals, occurs in tantalite, columbite, and other minerals… |
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