Columbite |  | Creators: Frederic P. Miller, Agnes F. Vandome, John McBrewster
Publisher: Alphascript Publishing
Category: Book
Buy New: $49.00
as of 9/8/2010 06:26 CDT details
New (5) Used (1) from $49.00
Seller: Amazon.com
Media: Paperback
Pages: 104
Number Of Items: 1
Shipping Weight (lbs): 0.4
Dimensions (in): 9 x 6 x 0.2
ISBN: 6131712735
EAN: 9786131712739
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Product Description
High Quality Content by WIKIPEDIA articles! Columbite, also called niobite, niobite-tantalite and columbate [(Fe, Mn)(Nb, Ta)2O6], is a black mineral group that is an ore of niobium and tantalum. It has a submetallic luster and a high density and is a niobate of iron and manganese, containing tantalate of iron. This mineral group was first found at Haddam, Middlesex County, Connecticut, in New England, USA. 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.
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