Gem, Rock, and Mineral Postage Stamps Featuring

Mineral Name: Columbite-tantalite
Composition: Iron manganese magnesium niobium tantalum oxide
Nomenclature: Named after its major chemical constituents, columbium (now niobium) and tantalum.
Industrial Uses: Ore of niobium (columbium) and tantalum.
Additional Notes: Columbite forms a series with the mineral tantalite. Columbite is the end-member with more niobium (at one time niobium was called columbium, hence the name columbite); tantalite is the end-member with more tantalum. Since columbite and tantalite exhibit very similar properties and since a detailed chemical analysis is generally needed to distinguish the two minerals, specimens from the series are typically referred to as columbite-tantalite.

Uganda Scott 599
Scott 599
1 shilling
18 Jan 1988

The stamp shows a natural, unpolished specimen. Philatelic Mineralogy Copyright © 1997-2010 by Richard Busch