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	underground economy underground mutton Underground Railroad undergrowth under guard underhand underhanded underhandedly underhandedness underhit underhung underinsurance NiCad Nicaea Nicaean Nicam nicanee Nicaragua Nicaragua, Lake Nicaraguan Nicaragua wood nicardipine niccolite nicconee nice

英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。