Manganotantalite

Big Photo

Afghanistan
8.35 carats
© irocks.com

Manganotantalite is a manganese-rich variety of Tantalite. It is formed when manganese replaces iron.

Manganotantalite is an intense red transparent material that is suitable for cutting into magnificent faceted gems.

Manganotantalite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 

Manganotantalite Gemstones by Size

This table shows distribution of Manganotantalite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.74 cts
Heaviest:8.35 cts
Average:4.55 cts
Total photos:4
Do you have a larger Manganotantalite? Why not upload a photo?
0.74ct to 1.50ct1.50ct to 2.26ct2.26ct to 3.02ct3.02ct to 3.78ct3.78ct to 4.55ct4.55ct to 5.31ct5.31ct to 6.07ct6.07ct to 6.83ct6.83ct to 7.59ct7.59ct to 8.35ct
General Information
A variety or type of:Tantalite
Other Names/Trade Names:
Chemical Formula
MnTa
 
2
O
 
6
Walter Schumann, Gemstones of the world (2001)
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Photos of natural/un-cut material from mindat.org
Physical Properties of Manganotantalite
Mohs Hardness5.5 to 6.5
Walter Schumann, Gemstones of the world (2001)
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Specific Gravity7.73 to 7.97
Walter Schumann, Gemstones of the world (2001)
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Cleavage QualityPerfect
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical Properties of Manganotantalite
Refractive Index2.19 to 2.34
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterBiaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Birefringence0.015
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Colour
Colour (General)Scarlet-red to dark red.
Walter Schumann, Gemstones of the world (2001)
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TransparencyTransparent
Walter Schumann, Gemstones of the world (2001)
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LustreVitreous
Walter Schumann, Gemstones of the world (2001)
Crystallography of Manganotantalite
Crystal SystemOrthorhombic
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
HabitShort prismatic crystals
Michael O’Donoghue, Gems, Sixth edition (2006)
Geological Environment
Where found:Occurs in granite pegmatites.
Michael O’Donoghue, Gems, Sixth edition (2006)
Further Information
Mineral information:Manganotantalite information at mindat.org
Significant Gem Localities
Brazil
 
Mozambique
 
  • Zambezia Province
    • Alto Ligonha District
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