| 单词 | columbite |
| 释义 | columbite (once / 176408 pages) n WORD FAMILY columbite USAGE EXAMPLESThe region has a history of tin and columbite mining - abandoned mines mark the landscape. BBC(Mar 12, 2010) They are probably present in the form of columbite, a niobate of iron and manganese; and tantalite, a tantalate of the same metals. Beringer, Cornelius, A Text-book of Assaying: For the Us...(2010) n a black mineral that is an ore of niobium and tantalum Syn|Hyper niobite mineral solid homogeneous inorganic substances occurring in nature having a definite chemical composition |
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