Tantalite 2.78 ct.

Tantalite

is a Iron Manganese Tantalium Niobium Oxide with formula (Fe, Mn)(Ta, Nb)2O6, and hardness of 6-6.5.

Tantalite forms a series with Columbite, often called Columbite-Tantalite, but Tantalite contain more tantalium and it has a higher specific weight compared with Columbite.

The appeareance is always black or dark brown, sub metallic look,good luster.

Has been found in Colorado.

Size:7.5x7.5x5.1 mm.

Weight:2.78 ct.

CODE#4296