Stibiotantalite
Afghanistan
6.34 carats
© Rarestone.com
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.
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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
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| General Information | |||||||||||||||||
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| Chemical Formula |
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| Physical Properties of Stibiotantalite | |||||||||||||||||
| Mohs Hardness | 5.5 to 6, Gemmological Tables (2004) More from other references | ||||||||||||||||
| Specific Gravity | 7.20 to 7.90, Gemmological Tables (2004) More from other references | ||||||||||||||||
| Tenacity | Brittle, Handbook of mineralogy (2001) | ||||||||||||||||
| Cleavage Quality | Distinct, Gemmological Tables (2004) | ||||||||||||||||
| Fracture | Sub-Conchoidal, Handbook of mineralogy (2001) | ||||||||||||||||
| Optical Properties of Stibiotantalite | |||||||||||||||||
| Refractive Index | 2.37 to 2.45, Gemmological Tables (2004) More from other references | ||||||||||||||||
| Optical Character | Biaxial/+, Gemmological Tables (2004) More from other references | ||||||||||||||||
| Birefringence | 0.08, Gemmological Tables (2004) More from other references | ||||||||||||||||
| Dispersion | Strong, Handbook of mineralogy (2001) | ||||||||||||||||
| Colour | |||||||||||||||||
| Colour (General) | Brown, yellow-brown, reddish, greenish, Gemmological Tables (2004) More from other references | ||||||||||||||||
| Transparency | Transparent, Gemmological Tables (2004) More from other references | ||||||||||||||||
| Lustre | Adamantine,Resinous, Handbook of mineralogy (2001) | ||||||||||||||||
| Crystallography of Stibiotantalite | |||||||||||||||||
| Crystal System | Orthorhombic, Gemmological Tables (2004) More from other references | ||||||||||||||||
| Habit | Equant or flattened prismatic crystals, Gems, Sixth Edition (2006) | ||||||||||||||||
| Geological Environment | |||||||||||||||||
| Where found: | Stibiotantalite occurs in complex granite pegmatites., Gems, Sixth Edition (2006) | ||||||||||||||||
| Further Information | |||||||||||||||||
| Mineral information: | Stibiotantalite information at mindat.org | ||||||||||||||||
| Significant Gem Localities | |||||||||||||||||
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