Tantalite

FerrotantaliteManganotantalitetantalite-(Mn)tantalite-bearing
The mineral group tantalite [(Fe, Mn)Ta 2 O 6 ] is the primary source of the chemical element tantalum.wikipedia
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Tantalum

TaSolid oxide Hall–Héroult process 182 Ta
The mineral group tantalite [(Fe, Mn)Ta 2 O 6 ] is the primary source of the chemical element tantalum.
Tantalum, always together with the chemically similar niobium, occurs in the mineral groups tantalite, columbite and coltan (a mix of columbite and tantalite, though not recognised as a separate mineral species).

Coltan

columbite-tantalitecolombo-tantalitecolumbite–tantalite
It is chemically similar to columbite, and the two are often grouped together as a semi-singular mineral called coltan or "columbite-tantalite" in many mineral guides.
The niobium-dominant mineral in coltan is columbite (after niobium's original American name columbium), and the tantalum-dominant mineral is tantalite.

Columbite

NiobiteColumbite-(Fe)Ferrocolumbite
It is chemically similar to columbite, and the two are often grouped together as a semi-singular mineral called coltan or "columbite-tantalite" in many mineral guides.
It forms a series with the tantalum-dominant analogue ferrotantalite and one with the manganese-dominant analogue manganocolumbite.

Tapiolite

Tantalite is also very close to tapiolite.
Tapiolite is very close to columbite and tantalite.

Nigeria

Federal Republic of NigeriaNigerianNGA
It has been found in Australia, Brazil, Canada, Colombia (Guainía and Vichada), Egypt, northern Europe, Madagascar, Namibia, Nigeria, Rwanda, The Democratic Republic of Congo, the United States (California, Colorado, Maine, and Virginia), and Zimbabwe.
Nigeria also has a wide array of underexploited mineral resources which include natural gas, coal, bauxite, tantalite, gold, tin, iron ore, limestone, niobium, lead and zinc.

Mineral

mineralsmineral depositsaccessory mineral
The mineral group tantalite [(Fe, Mn)Ta 2 O 6 ] is the primary source of the chemical element tantalum.

Iron

FeFe 2+ Fe(III)
The mineral group tantalite [(Fe, Mn)Ta 2 O 6 ] is the primary source of the chemical element tantalum.

Manganese

Mnmanganese oreMn 2+
The mineral group tantalite [(Fe, Mn)Ta 2 O 6 ] is the primary source of the chemical element tantalum. Manganese-rich tantalites can be brown and translucent.

Oxygen

OO 2 molecular oxygen
The mineral group tantalite [(Fe, Mn)Ta 2 O 6 ] is the primary source of the chemical element tantalum.

Chemical element

elementelementschemical elements
The mineral group tantalite [(Fe, Mn)Ta 2 O 6 ] is the primary source of the chemical element tantalum.

Specific gravity

specific gravitiessgdensities
However, tantalite has a much greater specific gravity than columbite (8.0+ compared to columbite's 5.2).

Orthorhombic crystal system

orthorhombicorthorombicorthorhombic system
Those minerals have same chemical composition, but different crystal symmetry orthorhombic for tantalite and tetragonal for tapiolite.

Tetragonal crystal system

tetragonaltetragonal systembody-centered tetragonal
Those minerals have same chemical composition, but different crystal symmetry orthorhombic for tantalite and tetragonal for tapiolite.

Transparency and translucency

translucenttransparenttransparency
Manganese-rich tantalites can be brown and translucent.

Australia

AUSAustralianCommonwealth of Australia
It has been found in Australia, Brazil, Canada, Colombia (Guainía and Vichada), Egypt, northern Europe, Madagascar, Namibia, Nigeria, Rwanda, The Democratic Republic of Congo, the United States (California, Colorado, Maine, and Virginia), and Zimbabwe.

Brazil

BRABrasilBrazilian
It has been found in Australia, Brazil, Canada, Colombia (Guainía and Vichada), Egypt, northern Europe, Madagascar, Namibia, Nigeria, Rwanda, The Democratic Republic of Congo, the United States (California, Colorado, Maine, and Virginia), and Zimbabwe.

Canada

CanadianCANCanadians
It has been found in Australia, Brazil, Canada, Colombia (Guainía and Vichada), Egypt, northern Europe, Madagascar, Namibia, Nigeria, Rwanda, The Democratic Republic of Congo, the United States (California, Colorado, Maine, and Virginia), and Zimbabwe.

Colombia

COLRepublic of ColombiaColombian
It has been found in Australia, Brazil, Canada, Colombia (Guainía and Vichada), Egypt, northern Europe, Madagascar, Namibia, Nigeria, Rwanda, The Democratic Republic of Congo, the United States (California, Colorado, Maine, and Virginia), and Zimbabwe.

Guainía Department

GuainíaDepartment of GuainíaGuainia
It has been found in Australia, Brazil, Canada, Colombia (Guainía and Vichada), Egypt, northern Europe, Madagascar, Namibia, Nigeria, Rwanda, The Democratic Republic of Congo, the United States (California, Colorado, Maine, and Virginia), and Zimbabwe.

Vichada Department

VichadaDepartment of Vichada
It has been found in Australia, Brazil, Canada, Colombia (Guainía and Vichada), Egypt, northern Europe, Madagascar, Namibia, Nigeria, Rwanda, The Democratic Republic of Congo, the United States (California, Colorado, Maine, and Virginia), and Zimbabwe.

Egypt

EgyptianEGYArab Republic of Egypt
It has been found in Australia, Brazil, Canada, Colombia (Guainía and Vichada), Egypt, northern Europe, Madagascar, Namibia, Nigeria, Rwanda, The Democratic Republic of Congo, the United States (California, Colorado, Maine, and Virginia), and Zimbabwe.

Europe

EuropeanEUEuropean continent
It has been found in Australia, Brazil, Canada, Colombia (Guainía and Vichada), Egypt, northern Europe, Madagascar, Namibia, Nigeria, Rwanda, The Democratic Republic of Congo, the United States (California, Colorado, Maine, and Virginia), and Zimbabwe.

Madagascar

MalagasyMadagascanMalagasy politician
It has been found in Australia, Brazil, Canada, Colombia (Guainía and Vichada), Egypt, northern Europe, Madagascar, Namibia, Nigeria, Rwanda, The Democratic Republic of Congo, the United States (California, Colorado, Maine, and Virginia), and Zimbabwe.

Namibia

NamibianRepublic of NamibiaSouth West Africa
It has been found in Australia, Brazil, Canada, Colombia (Guainía and Vichada), Egypt, northern Europe, Madagascar, Namibia, Nigeria, Rwanda, The Democratic Republic of Congo, the United States (California, Colorado, Maine, and Virginia), and Zimbabwe.