tantalite
red manganotantalite crystal from Brazil
red manganotantalite crystal frm Brazil
red manganotantalite from Afghanistan
solid like inclusions
solid like inclusions
Detailed sheet
tantalite
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.
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
metallic, vitreous
Hardness
5.5 to 6.5
Density
5.20 to 8.20
Cleavage
indistinct
Fracture
conchoidal, uneven
OPTICAL PROPERTIES
Transparency
opaque, translucent, transparent
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
Fluorescence
none
CRYSTALS PROPERTIES
tabular, massive prisms
crystals system
orthorhombic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Finland where she was discovered, in Australia, Brazil, Madagascar, Mozambique, USA, China.
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.
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.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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