The name Columbite has been discredited by the IMA, with the more specific designations of Columbite-(Fe) (also known as Ferrocolumbite), and Columbite-(Mn) (also known as Manganocolumbite) being used for this mineral's IMA-accepted nomenclature.Most Columbite specimens are of the Ferrocolumbite; Manganocolumbite is far less common. An even rarer …
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WhatsApp: +86 18221755073An Overview of Columbite Mineral. Columbite is a black, crystalline mineral group, and the main ore of niobium which is also called columbate, niobite, and niobite-tantalite [(Fe, Mn)Nb2O6], it is also a niobate of iron and manganese. It is found in granite, pegmatites, and placer deposits together with tantalite, but has less density.
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WhatsApp: +86 18221755073columbite (niobite, tantalite) A mineral oxide (Fe,Mn)(Ta,Nb) 2 O 6; when Ta > Nb the mineral is called tantalite, but when Ta < Nb it is called columbite; sp. gr. 5.2–6.5, increasing with increasing Ta content; hardness 6.0–6.5; orthorhombic; weakly magnetic; black or brownish-black; very dark red streak; sub-metallic lustre; crystals ...
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WhatsApp: +86 18221755073ID Species Reference Link Year Locality Pressure (GPa) Temp (K) 0001435: Columbite-(Fe) Wenger M, Armbruster T, Geiger C A (1991) Cation distribution in partially ordered columbite from the Kings Mountain pegmatite, North Carolina American Mineralogist 76 1897-1904 1991: 0: 100: 0001436: Columbite-(Fe)
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WhatsApp: +86 18221755073Columbite-(Mn) Plumbopyrochlore Comments: Yellow-brown plumbopyrochlore crystalline crust over black manganocolumbite grain.Such plumbopyrochlore-manganocolumbite ovoids with different grade of replacement are very typical for the locality. Location: Amazonite pegmatites of Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, …
WhatsApp: +86 18221755073Lahti, S. (2000): Compositional variation in columbite group minerals from different types of granitic pegmatites of the Eräjärvi district,South Finland. Journal of the Czech Geological Society. 45 (1-2),107-118 ... Minerals of the Chandler Mine, A Zoned Lithium Rich Pegmatite (Rocks and Minerals, 60:263-264); Rocks & Minerals (2005) 80:242 ...
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