单词	columbite
释义	columbite /kəˈlʌmbʌɪt / noun [mass 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. Origin Early 19th century: from columbium + -ite1.
随便看	separatory sepd. Sepedi Sephadex Sephardi Sephardic Sepharose sephira sepia pedologist pedology pedomancy pedometer pedometric pedometry pedomorphism pedomotive pedon pedophile pedophilia pedoscope pedosphere pedrail pedregal pedrero

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