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columbite-tantalite

n.
1.a valuable black mineral combining niobite and tantalite

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    Idiom of the Day

    mull over (something) or mull (something) over
    to think about something carefully
    I took much time to mull over the job offer from our competitor.



    1.
    I don't know exactly when we'll go but we really must visit them one of ________ days.

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