Tantalite, [(Fe, Mn) Ta₂O₆], is a mineral that is close to columbite. In fact, the two are often grouped together as a semi-singular mineral called columbite-tantalite in many mineral guides. But Tantalite has a much greater specific gravity than Columbite (8.0+ compared to Columbite's 5.2). General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... General Name, Symbol, Number manganese, Mn, 25 Chemical series transition metals Group, Period, Block 7, 4, d Appearance silvery metallic Atomic mass 54. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Atomic mass 15. ... Minerals are natural compounds formed through geological processes. ... Ferrocolumbite, also called niobite, columbate and columbite [(Fe, Mn)(Nb, Ta)2O6] is a black mineral that is an ore of niobium and tantalum. ... Coltan is the colloquial African name for (columbite-tantalite), a metallic ore comprising Niobium and Tantalum. ... Relative density (also known as specific gravity) is a measure of the density of a material. ...

Tantalite is black to brown in both color and streak. Manganese rich tantalites can be brown and translucent. Tantalite has been found in Namibia,Nigeria, Canada, Madagascar, northern Europe, and Maine, California, Colorado and Virginia in the United States. Brazil has the world's largest reserve of Tantalite (52.1%). As at 2006, 75% of world tantalite production comes from Australia. General Name, Symbol, Number manganese, Mn, 25 Chemical series transition metals Group, Period, Block 7, 4, d Appearance silvery metallic Atomic mass 54. ... In optics, transparency is the property of being transparent, or allowing light to pass. ... World map showing Europe A satellite composite image of Europe Europe is one of the seven traditional continents of the Earth. ... This article or section does not cite its references or sources. ... Official language(s) English Capital Sacramento Largest city Los Angeles Area  Ranked 3rd  - Total 158,302 sq mi (410,000 km²)  - Width 250 miles (400 km)  - Length 770 miles (1,240 km)  - % water 4. ... It has been suggested that this article be split into multiple articles. ... Official language(s) English Capital Richmond Largest city Virginia Beach Area  Ranked 35th  - Total 42,793 sq mi (110,862 km²)  - Width 200 miles (320 km)  - Length 430 miles (690 km)  - % water 7. ...

Tantalite is used as an ore of tantalum and niobium and as mineral specimens and occur in pegmatites. Some specimens may show a bluish iridescent tarnish and demonstrate weak magnetism. General Name, Symbol, Number tantalum, Ta, 73 Chemical series transition metals Group, Period, Block 5, 6, d Appearance gray blue Atomic mass 180. ... General Name, Symbol, Number niobium, Nb, 41 Chemical series transition metals Group, Period, Block 5, 5, d Appearance gray metallic Atomic mass 92. ... Pegmatite is a very coarse-grained igneous rock that has a grain size of 20 mm or more; such rocks are referred to as pegmatitic. ... Tarnish is a layer of corrosion that develops over copper, brass, silver, aluminum as well as a degree of semi-reactive metals as they undergo oxidation. ... Magnetic lines of force of a bar magnet shown by iron filings on paper In physics, magnetism is one of the phenomena by which materials exert an attractive or repulsive force on other materials. ...

Tantalite is largely found mixed with columbite in an ore called coltan. Coltan is the colloquial African name for (columbite-tantalite), a metallic ore comprising Niobium and Tantalum. ...

See also

• Ferrotantalite
• List of minerals