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columbite n.【礦物】鈮鐵礦。

columbium

The compositions of usual elements and rare earth elements and inclusions of corundum megacrysts related to alkali basalt in changle , shandong province , are analyzed . in the main parts of corundum megacrysts are a large number of fluid - melting inclusions , zircon , ta - columbite inclusions , and in the central crystal core are a large number of melting inclusions . the corundum megacrysts were formed in different periods and different physical chemistry conditions . the crystal core was formed in magma system , and the main parts were formed in inhomogeneously geochemical conditions in which magam and fluid phases coexisted 分析山東昌樂與堿性玄武巖有關的剛玉巨晶不同部位的常量元素、稀土元素及包裹體組成.剛玉巨晶的主體以大量流體?熔體包裹體、鋯石、鈮(鉭)鐵礦包裹體為主,而巨晶中的“晶核”部位則以大量的熔體包裹體為主,反映研究區的剛玉巨晶是在不同的階段形成的.剛玉“晶核”以及“銅皮剛玉”形成于熔體相為主的體系中,而主體剛玉則形成于熔體?流體過渡的急劇變化的不均一的地球化學環境中

We are one of the biggest end user of tantalite and columbite . we need the ores at the long - term . if you have the ores to sell , please contact us instantly 我們是中國最大的使用鉭鈮礦公司之一,我們長期需要鉭礦和鈮礦.如果你有這些礦石,請直接聯系我們

Preparation and characterization of pmn - pt relaxation ferroelectric powder by columbite precursor method 弛豫鐵電體及其表征

Study of intensive decomposition technique of titanium - columbite - tantalite ore 鈦鉭鈮礦強化分解工藝的研究