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Tantalite

>> Group(s) : oxides
See the pictures :

In the family of colombo - tantalites the tantalites can be high in iron or manganese.
The iron-rich variety is sometimes called niobite.
The rich in manganese, manganotantalite.

Exploited sites

It is found in Finland where she was discovered, in Australia, Brazil, Madagascar, Mozambique, USA, China.

See pictures of the mines / other pictures

Use in jewelry

Generally this is a black, opaque stone, used for industrial applications in special alloys.
Only a red gem variety can be cut with interest, it’s a collection stone.

Looking alike stones

goethite , hematite , wolframite

Historical healing properties

It would be a comforting stone, solid, that intervenes positively in difficult moments of life. It would show that there is always a solution, that nothing is final and that the outcome can often be pleasant. It would help to see the bright side, think positive, not daunted, not to succumb to negative thoughts.

Chemical characteristics
(Fe,Mn)[Ta,Nb]2O6

tantalum and niobium oxide

Physical characteristics

Main color : black

Other colors : brown, pink, red

the gem variety is brown - red

Color of streak : brown, black

Luster : vitreous, metallic

Hardness : 5.5 to 6.5

Density : 5.20 to 8.20

Cleavage : indistinct

Fracture : conchoidal, uneven

Optical properties

Transparency : transparent, translucent, opaque

generally opaque, transparent on some thin strips

Refractive Index : 2.190 - 2.440

Double refraction : 0.160

Very strong biaxial positive

visible double refraction : no

Dispersion : 0,146

Pleochroism : strong

Number of colors : 2

Brown, brown - red

red manganotantalite spectrum system

red manganotantalite spectrum system

Fluorescence : none

Crystals

Tabular, massive prisms

cristaux

Crystal system : orthorhombic

Other informations
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