Stibiotantalite
A variety of Minerals

What is Stibiotantalite?
Stibiotantalite is a mineral consisting of Sb(Ta,Nb)O4 (antimony, tantalum or niobium, and oxygen). It is found in complex granite pegmatites. If the quantity of niobium exceeds the tantalum content, the mineral is called stibiocolumbite. It is translucent to transparent, medium hard (5.5 mohs), appears yellow to dark brown, reddish or greenish brown, with an adamantine luster. Stibiotantalite is found in veins and walls associated with tin mines. It is a fairly rare to rare mineral. Due to its relative softness, it is more likely to be found in mineral collections than in jewelry.
Optical Properties
- Refractive Index
- 2.37-2.45
- Birefringence
- 0.08
- Optical Character
- Biaxial positive
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Stibiotantalite Localities Map
See where Stibiotantalite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Yellow to dark brown, reddish or greenish brown
- Hardness (Mohs)
- 5.5
- Density
- 7.58 g/cm³
- Streak
- Light yellow, yellow-brown
Chemical Properties
- Chemical Formula
- Sb(Ta,Nb)O4
- Elements
- O, Sb, Ta

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