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columbite

n.
1.a black mineral that is an ore of niobium and tantalum

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    Idiom of the Day

    straw that breaks the camel's back
    a small problem which follows other problems and which makes you lose patience and be unable to continue as before
    When the receptionist lost the key to the office for the third time it was the straw that broke the camel`s back and we decided to fire her.



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