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- Columbite abstract "Columbite, also called niobite, niobite-tantalite and columbate [(Fe, Mn)Nb2O6], is a black mineral group that is an ore of niobium. It has a submetallic luster and a high density and is a niobate of iron and manganese. This mineral group was first found in Haddam, Connecticut, in the United States. It forms a series with the tantalum-dominant analogue ferrotantalite and one with the manganese-dominant analogue manganocolumbite. The iron-rich member of the columbite group is ferrocolumbite. Some tin and tungsten may be present in the mineral. Yttrocolumbite is the yttrium-rich columbite with the formula (Y,U,Fe)(Nb,Ta)O4. It is a radioactive mineral found in Mozambique.Columbite has the same composition and crystal symmetry (orthorombic) as tantalite. In fact, the two are often grouped together as a semi-singular mineral series called columbite-tantalite or coltan in many mineral guides. However, tantalite has a much greater specific gravity than columbite, more than 8.0 compared to columbite's 5.2.Columbite is also very similar to tapiolite. Those minerals have same chemical composition but different crystal symmetry: orthorhombic for columbite and tetragonal for tapiolite. The largest documented single crystal of columbite consisted of plates 6 millimetres (0.24 in) thick measuring 76 by 61 centimetres (30 in × 24 in).The occurrence of columbite in the United States was made known from a specimen sent by Governor John Winthrop of Connecticut to Hans Sloane, President of the Royal Society of Great Britain. It was in columbite that Charles Hatchett discovered, in 1801, the element niobium, which he himself called columbium, after Columbia, a name for the United States, whence came the specimen in the British Museum collection which he examined.".
- Columbite thumbnail Columbite.jpg?width=300.
- Columbite wikiPageID "151481".
- Columbite wikiPageRevisionID "588811538".
- Columbite category Oxide_minerals.
- Columbite cleavage "[010] Distinct".
- Columbite color "Black, brownish black.".
- Columbite formula "Fe2+Nb2O6".
- Columbite fracture "Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.".
- Columbite gravity "5.3".
- Columbite habit "Massive - Granular - Common texture observed in granite and other igneous rock; Striated - Parallel lines on crystal surface or cleavage face.".
- Columbite hasPhotoCollection Columbite.
- Columbite luster "sub-metallic".
- Columbite mohs "6".
- Columbite name "Columbite-".
- Columbite opticalprop "Biaxial , b=2.29-2.4".
- Columbite other "non-radioactive, non-fluorescent.".
- Columbite streak "blackish brown".
- Columbite strunz "4".
- Columbite system "Orthorhombic, , SpaceGroup = Pcan".
- Columbite subject Category:Iron_minerals.
- Columbite subject Category:Manganese_minerals.
- Columbite subject Category:Niobium_minerals.
- Columbite subject Category:Orthorhombic_minerals.
- Columbite subject Category:Oxide_minerals.
- Columbite subject Category:Tantalum_minerals.
- Columbite type ChemicalSubstance.
- Columbite type Mineral.
- Columbite type ChemicalObject.
- Columbite type Thing.
- Columbite comment "Columbite, also called niobite, niobite-tantalite and columbate [(Fe, Mn)Nb2O6], is a black mineral group that is an ore of niobium. It has a submetallic luster and a high density and is a niobate of iron and manganese. This mineral group was first found in Haddam, Connecticut, in the United States. It forms a series with the tantalum-dominant analogue ferrotantalite and one with the manganese-dominant analogue manganocolumbite. The iron-rich member of the columbite group is ferrocolumbite.".
- Columbite label "Columbiet".
- Columbite label "Columbit".
- Columbite label "Columbita".
- Columbite label "Columbite".
- Columbite label "Columbite".
- Columbite label "Ferrocolumbite".
- Columbite label "Kolumbit".
- Columbite label "Niobite".
- Columbite label "Колумбит".
- Columbite sameAs Columbit.
- Columbite sameAs Κολουμπίτης.
- Columbite sameAs Columbita.
- Columbite sameAs Ferrocolumbite.
- Columbite sameAs Columbite.
- Columbite sameAs Columbiet.
- Columbite sameAs Kolumbit.
- Columbite sameAs Niobite.
- Columbite sameAs m.05_5sd8.
- Columbite sameAs Q899841.
- Columbite sameAs Q899841.
- Columbite wasDerivedFrom Columbite?oldid=588811538.
- Columbite depiction Columbite.jpg.
- Columbite isPrimaryTopicOf Columbite.
- Columbite name "Columbite-(Fe)".