Definition of columbite in English:

columbite

Pronunciation /ˈkäləmˌbīt/ /ˈkɑləmˌbaɪt/

noun

  • A black mineral, typically occurring as dense tabular crystals, consisting of an oxide of iron, manganese, niobium, and tantalum. It is the chief ore of niobium.

    ‘The abundance of these elements in the parental magma leads to the formation of less-common minerals such as apatite, beryl, topaz, amblygonite, lepidolite, spodumene tantalite, columbite, monazite, zircon, and uraninite.’
    • ‘It occurs most commonly in the minerals columbite, tantalite, and microlite.’
    • ‘These minerals are columbite, microlite, futile, thorite, and zircon.’
    • ‘Beryl, columbite, and triphylite are common accessory minerals in the Estes pegmatite, especially in the coarse-grained layers.’
    • ‘It is most abundant in the coarse-grained facies and is often associated with triphylite, columbite, and sphalerite.’

Origin

Early 19th century from columbium+ -ite.