Stibiotantalite

Big Photo

Afghanistan
6.34 carats
© Rarestone.com

The name Stibiotantalite reflects its antimony (Greek - stibi) content and similarity to Tantalite.

Stibiotantalite forms transparent or semi-transparent yellowish to brownish equant or flattened prismatic crystals. It is heavier, softer and brighter than tantalite.

Stibiotantalite can be cut into bright fiery golden-brown gems which have some resemblance to sphalerite.

Stibiotantalite Gemstones by Colour

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

Stibiotantalite Gemstones by Size

This table shows distribution of Stibiotantalite 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:0.73 cts
Heaviest:6.34 cts
Average:3.54 cts
Total photos:2
Do you have a larger Stibiotantalite? Why not upload a photo?
0.73ct to 1.29ct1.29ct to 1.85ct1.85ct to 2.41ct2.41ct to 2.97ct2.97ct to 3.54ct3.54ct to 4.10ct4.10ct to 4.66ct4.66ct to 5.22ct5.22ct to 5.78ct5.78ct to 6.34ct
General Information
Chemical Formula
SbTaO
 
4
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Photos of natural/un-cut material from mindat.org
Physical Properties of Stibiotantalite
Mohs Hardness5.5 to 6
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity7.20 to 7.90
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TenacityBrittle
Anthony et al, Handbook of mineralogy (2001)
Cleavage QualityDistinct
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
FractureSub-Conchoidal
Anthony et al, Handbook of mineralogy (2001)
Optical Properties of Stibiotantalite
Refractive Index2.37 to 2.45
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterBiaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Birefringence0.08
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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DispersionStrong
Anthony et al, Handbook of mineralogy (2001)
Colour
Colour (General)Brown, yellow-brown, reddish, greenish
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreAdamantine,Resinous
Anthony et al, Handbook of mineralogy (2001)
Crystallography of Stibiotantalite
Crystal SystemOrthorhombic
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
HabitEquant or flattened prismatic crystals
Michael O’Donoghue, Gems, Sixth Edition (2006)
Geological Environment
Where found:Stibiotantalite occurs in complex granite pegmatites.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Stibiotantalite information at mindat.org
Significant Gem Localities
Mozambique
 
  • Zambezia Province
    • Alto Ligonha District
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 455
Sri Lanka
 
  • Sabaragamuwa Province
    • Ratnapura District
      • Ratnapura
USA
 
  • California
    • San Diego Co.
      • Mesa Grande Mining District
        • Gem Hill
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 455
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