• Columbite - Wikipedia

    en.wikipedia.org/wiki/Columbite Columbite, also called niobite, niobite-tantalite and columbate [(Fe, Mn)Nb 2 O 6], 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 .
  • Columbite-(Fe): Mineral information, data and localities.

    www.mindat.org/min-1514.html The current species, columbite-(Fe) retains the old root name and has the suffix -(Fe) to indicate the dominance of iron in the species. Columbite was the second species named from the USA, after celestine (q.v.)
  • Columbite-(Fe) Mineral Data

    webmineral.com/data/Columbite-(Fe).shtml Columbite-(Fe) Upalite Comments: Thin translucent yellowish upalite crusts on a prismatic, black columbite crystal. Location: Thin translucent yellowish crusts on undifferntiated columbite crystal.
  • Columbite-(Fe) mineral information and data

    www.dakotamatrix.com/mineralpedia/6276/columbite-fe Columbite-Fe is an uncommon mineral that occurs generally as an accessory mineral in granite pegmatites, but can also be found in carbonatites, and as detritus in placer deposits. It is paramagnetic, and is attracted in the presence of an external magnetic field.
  • Columbite-(Fe) - National Gem Lab

    nationalgemlab.in/columbite-fe Columbite-(Fe) is a mineral that is fairly common rarely available as a faceted gem mostly since it is opaque black to brownish black. However, it could be somewhat attractive having its vitreous to luster that is sub-metallic when its surfaces tarnish and become iredescent. Columbite-(Fe) is relatively hard with a Mohs hardness of 6.0 and
  • Columbite-(Fe) : ClassicGems.net

    classicgems.net/gem_columbite.htm Columbite-(Fe) is a fairly common mineral but rarely available as a faceted gem mostly because it is opaque black to brownish black. However, it can be somewhat attractive with its vitreous to sub-metallic luster and when its surfaces tarnish and become iredescent.
  • Columbite: The mineral columbite-tantalite information and ...

    www.minerals.net/mineral/columbite.aspx Columbite is the niobium-rich member, and Tantalite is the tantalum-rich member. Columbite is named after its niobium content, which was previous known as columbium prior to its renaming. Columbite is the most important mineral containing the rare element niobium and is its main ore.
  • Columbite-(Fe) Mineral Gallery in Online Mineral Museum ...

    www.johnbetts-fineminerals.com/jhbnyc/mineralmuseum/gallery.php Columbite-(Fe) Minerals This gallery is part of the photographic archive of minerals. The minerals illustrated sold previously and are for photographic reference only.
  • Columbite | mineral | Britannica.com

    www.britannica.com/science/columbite Columbite, hard, black (often iridescent), heavy oxide mineral of iron, manganese, and niobium, (Fe, Mn)Nb2O6. Tantalum atoms replace niobium atoms in the crystal structure to form the mineral tantalite, which is similar but much more dense.
  • Columbite: Mineral information, data and localities.

    www.mindat.org/min-1112.html Columbite was long used as a species name but is now split between the iron end-member columbite-(Fe) and the manganese end-member columbite-(Mn) and consequently is the name of an isomorphous series (see Columbite-(Fe)-Columbite-(Mn) Series). The name columbite usually refers to (the more common) columbite-(Fe), formerly known as ferrocolumbite.