Tantalite n. : A heavy mineral of an iron-black color and submetallic luster. It is essentially a tantalate of iron.

Example:
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Taxonomy
Tantalite, mineral, free encyclopedia, columbite, Australia, Manganotantalite, Ferrotantalite, tapiolite, Colombia, mineral guides, mineral specimens, manganese, search, Pilbarra, Giz, RN, Brazil, Iron-rich.

Defination from the web:
tantalite in many mineral guides. ... Tantalite has been found in Namibia, Nigeria, Canada, Madagascar, northern Europe, and Maine, California, Colorado and Virginia in the United States. ...